4 Star Hero Unlock Potential Tier List | Fire Emblem Heroes

This is a tier list for the best 4 Star Heroes to Unlock Potential for in FEH. Use this tier list to know whether or not the 4 Star Heroes you pulled should be rerolled, or if you want to find out who the best 4 Star Heroes are.

4 Star Hero Unlock Potential Tier List Updates 2021

Date	Changes
6/23/2021	Summer Leonie Added to S
4/21/2021	Young Innes Added to SS Young Lyon Added to S Morgan (M) Added to A
3/05/2021	Major Revisions to the 4★ Unlock Potential Tier List

SS Rank: Units with the Highest Priority for Unlock Potential

SS Rank: Units from Normal Summoning Pools

Hero	Rarities	Strengths and Characteristics at 5★
Reinhardt	4★ 3★	Recommended IVs: +Atk Role: Cavalry Ace / Main Offense ・Dire Thunder allows him to one-shot a wide range of units without requiring absurd levels of investment ・Ranks among the top attackers of all Heroes as he sports high firepower and excellent range
Reyson	4★ 3★	Recommended IVs: Base Values or +Spd Role: Dancer / Healer ・Heron Wing grants a passive team heal ・Skillset summary : 3 spaces of flying movement, access to a refresher-assist skill, and has a passive team heal with a modest range

SS Rank: Free Units | Heroic Grail Units

Hero	Rarities	Strengths and Characteristics at 5★
Aversa	4★ 3★	Recommended IVs: +HP Role: Debuff Support / Offensive Tome Unit ・Aversa’s Night inflicts a debuff on all enemies regardless of position ・One of the best unit for Aether Raids because her very powerful and convenient debuff
Young Innes	5★ 4★	Recommended IVs: +Atk Role: Offensive Infantry Bow Unit ・Bow of Frelia disables non-Special damage reduction skills upon Special activation ・+6 Atk/Spd boost in both phases accessible through prf. weapon ・Weapon deals +7 pure damage to foe when Special activates

SS Rank: Special Heroes

Hero	Rarities	Strengths and Characteristics at 5★
Young Marth	5★ 4★	Recommended IVs: +Atk Role: Sword Attacker ・Rapier is effective on armored and cavalry units ・Special skill increases his damage, buffs all allied units and has a very low cooldown of 2

S Rank: Characters with High Priority for Unlock Potential

S Rank: Characters from Normal Summoning Pools

Hero	Rarities	Strengths and Characteristics at 5★
Eliwood	4★ 3★	Recommended IVs: +Atk or +Spd depending on build Role: Cavalry Ace ・Weapon upgrade options turn him into a player phase powerhouse ・Guaranteed follow-up attack against axe wielders ・Requires lots of investment, but he provides so much at high investment levels ・Access to a Resplendent Outfit and its bonus stats

S Rank: Free Units | Heroic Grail Units

Hero	Rarities	Strengths and Characteristics at 5★
Astram	4★ 3★	Recommended IVs: +Spd Roles: Buff Support ・Unlocks Mercurius ・Buffs nearby physical attackers
Itsuki	5★	Recommended IVs: +Atk Roles: Sword Attacker ・Unlocks Mirage Falchion which grants massive Atk/Def bonuses depending on the number of allies that have already acted ・Powerful against dragons as Mirage Falchion grants effective damage against them ・Can stack lots of Atk/Def even without investment ・Balanced stats across the board especially at max merges and flowers
Iago	4★ 3★	Recommended IVs: +HP Roles: Debuff Support ・Inflicts a heavy map-wide debuff on the enemy team ・Grants an Atk bonus to your most powerful offensive unit regardless of position ・Rivals Aversa as a debuff unit in Aether Raids
Naesala	4★ 3★	Recommended IVs: +Spd Roles: Offensive Beast ・Raven King Beak can be unlocked which grants him lots of damage if he stacks Spd ・A flying attacker who is capable of moving 3 spaces upon transformation—an ability which cannot be easily overlooked
Masquerade Eldigan	5★ 4★	Recommended IVs: +Atk Role: Dancer ・Flying refresher-assist unit ・Damage reduction against foes who scores follow-up attacks ・Grants a Def buff to unit with Def stat
Petrine	4★ 3★	Recommended IVs: +Atk Roles: Spear Attacker ・Flame Lance is effective on beast units ・Uses opponents' Res to deal damage if unit's HP is at least 50% ・Debuffs to surrounding opponents' Atk and Def ・Petrine is the closest thing we have to a cavalry dragonstone unit! Because of this and her beast effectiveness, she can fill-up lots of niches in your lineups.
Azura (Young)	5★ 4★	Recommended IVs: +Spd Roles: Dancer ・Book of Shadows inflicts an all-stat debuff to enemies in combat, and together with her A skill, creates a large stat gap in favor of Azura ・Reliable Dancer that also buffs her allies upon refresh ・Can be relied upon as a secondary offensive option!
Young Minerva	5★ 4★	Recommended IVs: +Spd Roles: Axe Flier Ace ・Dragoon Axe speeds-up Young Minerva's special cooldown and slows down foe's special activation ・Dragoon Shield both neutralizes flying-effective damage and grants +3 Atk/Spd/Def

S Rank: Special Heroes

Hero	Rarities	Strengths and Characteristics at 5★
Young Lyon	5★ 4★	Recommended IVs: +Atk Role: Offensive Tome Unit ・Tome of Grado is a powerful weapon regardless of battle phase ・Prf. weapon grants attribute advantage against colorless foes ・Is very available as a 4★ demote, but very powerful at high investment
Xane	5★ 4★	Recommended IVs: +HP Role: Offensive Tome Unit ・Stats equal to the strongest stats of all allies wihin 2 spaces calculated independently! ・Grants offensive buffs and adaptive damage to adjacent physical allies ・One of the few units that do not rely on merges, flowers or skill investment to be effective
Winter Hilda	5★ 4★	Recommended IVs: +Atk/+Spd Role: Offensive Armored Lance Unit ・Stronger when allies are nearby ・Makes it hard for foes to activate Specials ・Guarantees follow-up attacks and blocks enemy follow-ups in even-numbered turns
Summer Leonie	5★ 4★	Recommended IVs: +Spd Role: Offensive Cavalry Bow Unit ・Sunflower Bow+ greatly increases her Def, lowers foe's Def, neutralizes foe's buff to Def stat and adds it to her own. ・Can grant herself buffs for her Atk/Spd/Def through Atk/Spd Push and Spd/Def Link

A Rank: Solid Option to Invest Feathers In

A Rank: Characters from Normal Summoning Pools

Hero	Rarities	Strengths and Characteristics at 5★
Tharja	4★ 3★	Recommended IVs: +Spd Role: Red Tome Ace ・Tharja's Hex can be unlocked ・4★ with +10 merges is also a good option
Sophia	4★ 3★	Recommended IVs: +Def Role: Raven Tome Ace ・Unlocks Eternal Tome ・Very powerful against colorless foes ・Access to a Resplendent Outfit and its bonus stats
Caeda	4★ 3★	Recommended IVs: +Atk Role: Armor and Cavalry Check ・Wing Sword can be unlocked ・Useful as an anti-armor or anti-cavalry unit ・Access to a Resplendent Outfit and its bonus stats
Seliph	4★ 3★	Recommended IVs: +Atk Role: Aether Raids Defensive Unit ・Unlocks Tyrfing, Divine Tyrfing and their respective refine options ・Can add the effect of Miracle via the Weapon Refinery
Morgan (M)	4★ 3★	Recommended IVs: +Spd Role: Red Tome Ace ・Casts bonuses to allies while simultaneously inflicting penalties on foes ・Can nullify the bonuses from skills like Hone/Fortify on ranged units ・Can boost his allies' Def/Res
Bantu	4★ 3★	Recommended IVs: +Def Role: Physical Tank ・Inflicts a penalty over an area when initiating combat ・Gains a buff when foe initiates combat ・Inflicts fixed damage over an area when attacking
Tiki (Adult)	4★ 3★	Recommended IVs: +Def Role: Red Dragon Tank ・Can counterattack from any range ・Very high Def stat ・Can raise her allies' Res stat ・Has access to Breath of Fog
Cordelia	4★ 3★	Recommended IVs: +Atk Role: Offensive Lance Flier ・Cordelia's Lance and her high Spd allows for potential quad-attacks ・High Atk and Spd stats ・Access to a Resplendent Outfit and its bonus stats
Nowi	4★ 3★	Recommended IVs: +Def Role: General Tank ・Lightning Breath+ can be unlocked ・4★ with +10 merges is another good option
Clair	4★ 3★	Recommended IVs: +Atk Role: Armor and Cavalry Check ・Weapon is effective on armored and cavalry units ・Lance wielding unit with high Res ・Special refinement grants Rhomphaia effect identical to Flashing Blade
Robin (M)	4★ 3★	Recommended IVs: +Def Role: Buff Support ・Tactical Bolt can be unlocked ・Upgrading via the Weapon Refinery grants excellent team bonuses ・Access to a Resplendent Outfit and its bonus stats
Seteth	5★ 4★	Recommended IVs: +Spd Role: Offensive Lance Flier ・Stronger when allies are within 2 spaces ・Provides an Atk/Spd buff to allies ・Atk/Spd boost if at 80% HP or below
Est	4★ 3★	Recommended IVs: +Atk Role: Armor Check ・Weapon inflicts massive damage on armored units ・Greatly decreases a foe's Spd after combat ・Huge Res buff when HP gets below a certain threshold
Nino	4★ 3★	Recommended IVs: +Spd Role: Green Tome Ace ・Gronnblade+ and Iris's Tome can be unlocked ・4★ with a +10 merge is also a great option
Cherche	4★ 3★	Recommended IVs: +Atk Role: Offensive Axe Flier ・Cherche's Axe can be unlocked ・Being able to attack in succession makes her very powerful
Cecilia	4★ 3★	Recommended IVs: +Atk Role: Raven Tome Ace ・Gronnraven+ and Tome of Order can be unlocked ・4★ with +10 merges is also a good option
Ross	4★ 3★	Recommended IVs: +Atk Role: Axe Attacker ・Unlocks Brave Axe+ ・With a high Atk stat, can deal tons of damage if striking twice
Python	4★ 3★	Recommended IVs: +Spd Role: Green Cavalry Bow Attacker ・Unlocks Short Bow+ ・One of the few green bow cavalry units
Fae	4★ 3★	Recommended IVs: +Def Role: General Tank ・Light Breath+ and Eternal Tome can be unlocked ・4★ with +10 merges is also a good option
Boey	4★ 3★	Recommended IVs: +Def Role: Raven Tome Ace ・Unlocks Inscribed Tome ・Powerful against colorless foes, and can gain Close Counter through the Weapon Refinery
Rath	4★ 3★	Recommended IVs: +Spd Role: Green Cavalry Bow Attacker ・A mobile bow unit with a large attack radius ・Can gain a Spd and Res bonus ・Can lower the foe's Def stat
Echidna	4★ 3★	Recommended IVs: +Spd Role: Axe Attacker ・Unlocks Rearguard+ ・Def raised when the foe initiates combat ・Gains a Spd and Res buff when HP is below 80% ・Grants a buff to nearby allies' Atk
Klein	4★ 3★	Recommended IVs: +Atk Role: Offensive Infantry Bow Unit ・Brave Bow+ and Quick Riposte 3 can be unlocked ・4★ with +10 merges is another good option
Gordin	4★ 3★	Recommended IVs: +Spd Role: Offensive Infantry Bow Unit ・Unlocks Renowned Bow ・Can unleash powerful consecutive attacks
Norne	4★ 3★	Recommended IVs: +Spd Role: Offensive Infantry Bow Unit ・Very powerful against ranged attacks ・Gains a large Spd/Def bonus ・Can be used as a support unit as well
Kagero	4★ 3★	Recommended IVs: +Atk Role: Offensive Debuffer ・Weapon is effective on infantry units ・Guaranteed follow up attack against dagger wielding units ・Gains a Res bonus when initiating combat ・Access to Kagero's Dart

A Rank: Free Units | Heroic Grail Units

Hero	Rarities	Strengths and Characteristics at 5★
Kempf	4★ 3★	Recommended IVs: +Spd Role: Cavalry Attacker ・Unlocks Venin Edge ・Inflicts area damage to nearby foes after combat
Lyon	4★ 3★	Recommended IVs: +Atk Role: Raven-type Ace ・Can only be obtained as a reward from a Grand Hero Battle ・Gains triangle advantage against colorless units ・Grants a bonus to allies' Res
Ena	5★ 4★	Recommended IVs: +Atk Role: General Tank ・Gains a buff when an ally is within 2 spaces ・Can gain a buff alongside an ally when a movement assist is used ・Can buff nearby dragon allies
Ashnard	4★ 3★	Recommended IVs: +Atk Role: Physical Tank ・Exclusive weapon, Gurgurant, nullfies skills that are effective on flying units ・Inflicts a penalty on foes within two spaces
Black Knight	5★ 4★	Recommended IVs: +Atk/+Spd Role: Physical Tank ・Alondite and Black Luna can be unlocked ・Can counterattack at any range ・Black Luna is one of the most powerful specials in the game
Xander	4★ 3★	Recommended IVs: +Atk Role: Physical Tank ・Siegfried can be unlocked ・Can counterattack at any range
Rinea	5★ 4★	Recommended IVs: +Spd Role: Dancer ・Hero obtainable through Tempest Trials ・Possesses a refresher skill ・Gains a buff from using Dance
Camus	4★ 3★	Recommended IVs: +Spd Role: General Tank ・Gradivus can be unlocked ・Can counterattack at any range
Fallen Delthea	4★ 3★	Recommended IVs: +Spd Role: Offensive Blue Tome Unit ・Unlocks Death ・Excellent attack phase unit
Brunnya	5★ 4★	Recommended IVs: +Atk/+Spd Role: Magic Tank ・Neutralizes debuffs and grants bonuses ・Power increases when initiating combat ・Casts a debuff over several foes after combat
Jorge	4★ 3★	Recommended IVs: +Atk Role: Bow Attacker and Buff Support ・Grants allies a +5 Atk buff while simulataneously inficting a -5 Atk debuff on enemies ・Grants +6 Atk to ally with the highest Atk stat
Winter Jaffar	5★ 4★	Recommended IVs: +Spd Role: Offense Armored Dagger ・Can recover HP while casting debuffs ・Stats increase with adjacent allies ・Can buff allied armor units ・Access to Minty Cane+
New Year Keaton	5★ 4★	Recommended IVs: +Atk Role: Offensive Infantry Green Beast ・Weapon skill simultaneously debuffs foe's Def and buffs Keaton's Def ・Able to score additional damage by stacking Def ・Grants an Atk/Def bonus to allies when using a movement assist
Flame Emperor	4★ 3★	Recommended IVs: +Spd Role: Physical Tank ・Weapon prevents foe's special from triggering ・Gains a bonus when the foe initiates combat ・Great Atk and Def stats
Ninja Hana	5★ 4★	Recommended IVs: +Atk Role: Offensive Axe Attacker, Quad Striker ・Weapon skill allows her to strike twice in one attack ・Wrath makes her special easier to trigger and increases her damage output further ・Very high base Atk and Spd makes it very feasible for her to land Quad Strikes
Rolf	5★ 4★	Recommended IVs: +Spd Role: Cavalry Bow Attacker ・Unlocks Candlewax Bow+ ・Easy to use with default skillset
Winter Cecilia	5★ 4★	Recommended IVs: +Def Role: Offensive Armored Dagger ・One of the few armored dagger units ・Gains a buff when adjacent to an ally ・Casts a penalty on foes with lower Res than her own
Kronya	4★ 3★	Recommended IVs: +Spd Role: Debuff Role ・Unlocks Athame ・Weapon skill has Vantage built into it ・With some set-up, she can sweep enemy teams. In other words, she can take out a lot of enemies out without taking damage

A Rank: Special Heroes

Hero	Rarities	Strengths and Characteristics at 5★
New Year Kaden	5★ 4★	Recommended IVs: +Atk Role: Red Beast Infantry Attacker ・Weapon skill buffs Spd and inflicts a Spd debuff on foe ・Increases damage when Spd is higher than foes ・Inflicts Atk/Def debuffs on foes if a movement-assist skill is used by or used on Kaden
Rafiel	5★ 4★	Recommended IVs: +Spd Role: Dancer ・Speeds-up special cooldown count -1 of a partner unit ・When Sing is used on an ally, grants them Atk/Spd buffs ・Buffs Def/Res of allied beast units
Masquerade Lachesis	5★ 4★	Recommended IVs: +Atk Role: Dancer ・Refresher-assist support ・Damage reduction against foes who scores follow-up attacks ・Inflicts debuffs on enemies upon using refresher skill
Valentine's Alfonse	5★ 4★	Recommended IVs: +Atk Role: Armoted Green Tome ・Inflicts a debuff to enemies when allies are near ・Grants buffs to self when allies are near ・Guaranteed follow-up attack when initiating combat
Plegian Raphael	5★ 4★	Recommended IVs: +Atk/+Spd Role: Armored Bow Attacker ・Rare colorless armored bow unit ・Access to heavy debuffs when there are no adjacent allies around ・Weapon skill effectively doubles foe's penalties

Special: Units with Specific Roles | Support Units

Refresher-Assist Units | Dancers

Hero	Rarities	Strengths and Characteristics at 5★
Silvia	4★ 3★	Recommended IVs: +Spd Role: Dancer ・Equipped with a refresher skill ・Gains a massive Res+11 when the foe initiates combat ・Allies gain a stat boost when she grants them additional movement
Olivia	4★ 3★	Recommended IVs: +Spd Role: Dancer ・Equipped with a refresher skill ・Can raise the Atk of her allies ・Can be obtained via a Hero Battle
Rinea	5★ 4★	Recommended IVs: +HP Roles: Dancer/Buff Support ・Unlocks Silver Goblet+ which grants defensive bonuses to allies ・Grants offensive and defensive bonuses to ally upon refreshing them ・Works very well even at 4★
Masquerade Eldigan	5★ 4★	Recommended IVs: +Atk Role: Dancer ・Flying refresher-assist unit ・Damage reduction against foes who scores follow-up attacks ・Grants a Def buff to unit with Def stat
Rafiel	5★ 4★	Recommended IVs: +Atk Role: Dancer ・Speeds-up special cooldown count -1 of a partner unit ・When Sing is used on an ally, grants them Atk/Spd buffs ・Buffs Def/Res of allied beast units
Masquerade Lachesis	5★ 4★	Recommended IVs: +Atk Role: Dancer ・Refresher-assist support ・Damage reduction against foes who scores follow-up attacks ・Inflicts debuffs on enemies upon using refresher skill
Reyson	4★ 3★	Recommended IVs: Base Values or +Spd Role: Dancer / Healer ・Heron Wing grants a passive team heal ・Skillset summary : 3 spaces of flying movement, access to a refresher-assist skill, and has a passive team heal with a modest range
Azura (Young)	5★ 4★	Recommended IVs: +Spd Roles: Dancer ・Book of Shadows inflicts an all-stat debuff to enemies in combat, and together with her A skill, creates a large stat gap in favor of Azura ・Reliable Dancer that also buffs her allies upon refresh ・Can be relied upon as a secondary offensive option!
Tethys	4★ 3★	Recommended IVs: +Atk Role: Dancer ・Has a refresher skill ・Gains a bonus when adjacent to an ally ・Makes it easy to level up allies dagger users

List of Refresher-Assist Units and Ratings

Staff Units | Healers

Hero	Rarities	Strengths and Characteristics at 5★
Linhardt	5★ 4★	Recommended IVs: +Atk/+Spd Role: Healer ・Weapon skill deals out chip damage in an AoE ・Can heal allies from 2 spaces away ・Increases allies' durability when receiving ranged attacks
Mercedes	4★ 3★	Recommended IVs: +Def Role: Healer ・Gravity+ can be unlocked ・Excellent Res tank
Natasha	5★ 4★	Recommended IVs: +Spd/-Res Role: Healer ・Staff unit that can heal allies ・Can buff allies against melee attackers ・High Res stat
Lena	4★ 3★	Recommended IVs: +Spd/-Res Role: Healer ・Staff unit that can heal allies ・Restricts enemy movement to 1 space after combat Atk debuff for enemies with low Res
Eremiya	4★ 3★	Recommended IVs: +Spd Role: Healer ・Obtainable from Grand Hero Battles ・Atk/Res Buff when HP is at 100% ・Increases allies' durability when receiving ranged attacks
Emmeryn	4★ 3★	Recommended IVs: +Spd Role: Healer ・Infantry staff with a balanced stat spread ・Can buff her allies' Res ・Inflicts a penalty on foes' Atk after combat
Summer Rhys	5★ 4★	Recommended IVs: +Atk Role: Healer ・Inflicts a buff on nearby foes ・Gains a buff to Atk/Res in combat ・Can buff allies' Res
Clarine	4★ 3★	Recommended IVs: +Atk Role: Cavalry Healer ・A healer that can move up to 3 spaces ・Inflicts a debuff on the enemy ・Grants a buff to the allies' speed
Priscilla	4★ 3★	Recommended IVs: +Atk Role: Cavalry Healer ・Excellent assist skill ・Can buff her allies' Def stat ・Weak to physical attacks
Nanna	4★ 3★	Recommended IVs: +Spd Role: Cavalry Healer ・Restore+ can be unlocked ・A high Spd staff-wielding cavalry unit
Forrest	4★ 3★	Recommended IVs: +Res/+Atk Role: Cavalry Healer / Magic Tank ・Has skills to boost his Res ・Inflicts a penalty on the foe with the lowest Res ・Can easily get to an injured ally to heal them
Valentine's Silque	5★ 4★	Recommended IVs: Base Values/+Def Role: Cavalry Healer ・Buffs the ally with the highest Spd stat ・A mobile staff unit, very adept at supporting allies ・Excellent defensive stats
Ethlyn	5★ 4★	Recommended IVs: Base Values/+Spd Role: Cavalry Healer ・Spd/Def Bond 3 can be unlocked ・A fantastic support unit

List of Staff Units and Ratings

Tier List Criteria

This 4★ Unlock Potential Tier List primarily takes into consideration the full strength and skill access the unit has at 5★. In addition to that, whether or not the unit has access to a powerful special effect refine is also taken into consideration. To a lesser extent, the ease of use of the unit is taken into consideration but to a much lesser degree.

Ease of use refers to if whether or not a unit needs to meet very complex trigger conditions to be effective. It also means if whether or not a unit only shines in niche situations.

Which units should I use Unlock Potential on?

Refresher-Assist Units

In Fire Emblem Heroes, refresher-assist units are very powerful and important as it allows your most powerful units, to commit to two actions in a turn. Because they frequently become part of your line-ups as you head into harder or more competitive maps, it is wise to grant them a power boost through Unlocking their Potential.

List of Refresher-Assist Units and Ratings

Staff Healers

In modes such as Tempest Trials+ or Chain Challenges, healers become very important as you are sure to take small increments of damage per map. Without sustain, you are bound to fail in multi-map game modes. In general, it is recommended that you have at least one reliable 5★ healer. If you can aim for one with cavalry movement, the better!

List of Staff Units and Ratings

Units with powerful exclusive weapons

Since these kinds of weapons would not be present on any other character, a unit can be worth the feathers just because they possess a mighty weapon. For example, Reinhardt here has always been one of the most popular and go-to units in FEH because of his powerful Dire Thunder.

Fire Emblem Heroes adds new weapons and new special effect refines monthly, so who knows when your favorite characters get a mighty weapon that finally allows them to go toe-to-toe with the strongest units in the Arena!

List of Units with Exclusive Skills

Favorite characters!

Speaking of favorite characters, whether or not your favorite characters are at the top of our Tier Lists, we argue that it is always worth Unlocking their Potential. It makes playing the game so much more fun if you are playing with your favorites. You have nothing to lose as no unit is deemed unviable with enough merges, dragonflowers, and skill inheritance upgrades!

Tips & Notes for Unlock Potential

Use Unlock Potential on units that cover your main units' weaknesses

While playing the game, you are bound to develop some favorites that are reliable on any map whether it be PvE or PvP. At this point, it is only natural to deploy units that naturally complement them and cover their weaknesses. It is recommended that you Unlock their Potential because your most powerful units deserve some very powerful allies to storm battles with!

Example on a all-cavalry team

Xander [8.0/10]

Reinhardt [9.0/10]

Cecilia [8.0/10]

Nanna [7.5/10]

Consider this team whose main units are Xander and Reinhardt. They will spearhead the offense of this team, and they can do so very reliably, but they are not without weaknesses.

Cecilia, is a good choice for a 3rd option as she specializes in taking out Blue units with her Tome of Order. This way, the team covers all sides of the attribute triangle.

Nanna, is simply the healer of the team. Because she too is a cavalry unit, she can carry Sacred Seals or skills like Hone Cavalry that compliment the team.

Strongly consider the free units from Tempest Trials+ and Grand Hero Battles!

Just because they are free, does not mean that they lack in firepower! Some are meh, but some are actual powerhouses that do their job properly with minimal investment! Make sure to participate in Grand Hero Battles and take part in Tempest Trials+ to get free heroes. If they do not find spots in your teams, they can be used as fodder!

To get previously released free units, or if you plan on getting merges, you can use Heroic Grails to claim copies of these free units.

Use Unlock Potential on the Askr Trio

Alfonse [7.5/10]

Sharena [7.5/10]

Anna [7.5/10]

The Askr trio are featured in Aether Raids and the Arena as rotating bonus units. This means you can use them for you to be able to score more in these game modes. They are also featured in many quests that you can complete to get valuable resources such as Orbs.

These use cases jusitfy the small fee of 20,000 Hero Feathers per Askr member as the investment will definitely help you in the long run. The sooner you Unlock their Potential, the sooner they show you their true value.

Try not to simultaneously invest on similar units

Make sure that you are investing in a wide range of units. For example, avoid investing in Nagi if you already have a well-invested Winter Sothis and vise-versa as they are both tanky green dragon units that do well against magical attacks and dish out heavy damage in both phases.

Only do so if you are running out of options in modes such as Arena Assault.

How to strengthen your units on top of Unlock Potential

Turning a unit into a 5★, is not the limit of a unit's growth. You can power-up units even further through other means. Check out the articles above to know how to power-up your units even further!

4★ Unlock Potential Tier List Summary

This Tier List is based on our recommendations for using Unlock Potential on 4★ Heroes. 4★+10 Heroes have the same stats as 5★+5 Heroes, so it is sometimes better to continue to Merge Allies with a 4★ Hero instead of using Unlock Potential to increase their rarity. For this reason, you should prioritize Heroes who gain powerful Exclusive Skills at 5★ or Heroes that you simply love when using Unlock Potential.

When Should You Unlock Potential? Will IVs Change?

Other Tier Lists

Hero Rankings: Top Page

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Tier Lists
Hero Tier List	Reroll Tier List	Skill Tier List
Source Heroes	Weapon Refinery	Unlock Potential