Summer Byleth (F) Builds and Best IVs

This is a ranking page for the hero Byleth - Fell Star's Duo from the game Fire Emblem Heroes (FEH). Read on to learn the best IVs (Individual Values), best builds (Inherit Skill), weapon refinement, stats at Lv 40, and more for Summer Byleth (F).

Heroes With the Same Name
Byleth (F)	Byleth (M)
Summer Byleth (F)	Legendary Byleth (M)
Legendary Byleth (F)	Brave Byleth (F)
Sage Byleth (M)	Fallen Byleth (F)
Winter Byleth (M)

Special Heroes - Overseas Memories Featured Heroes
Summer Byleth (F) [9.0/10]	Summer Ingrid [9.0/10]	Summer Sylvain [8.0/10]	Summer Dorothea [8.0/10]

Summer Byleth (F) Rating and Basic Information

Overall Rating	9.0/10
Reroll Ranking (excluding Inherit Skill)	A (▶Reroll Ranking)
Ranking (including Inherit Skill)	A (▶FEH Tier List)

Byleth - Fell Star's Duo: Basic Information

Color / Weapon Type / Move Type	Red / Red Tome / Flying
Rarity	5 Star
What Kind of Character Are They?	・Has a unique Duo Skill ・Weapon prevents enemy skills that guarantee follow-up and neutralizes skills that prevent unit from making follow-ups ・Powerful buffs to Atk and Spd

Summer Byleth (F) Skills at 5★

Sun's Percussors Might: 14　 Range: 2 Accelerates Special trigger (cooldown count -1). At start of combat, if unit’s Spd > foe’s Spd or if foe’s HP = 100%, grants Atk/Spd +5 to unit during combat and neutralizes effects that guarantee foe’s follow-up attacks and effects that prevent unit’s follow-up attacks.

Ruptured Sky Cooldown Count = 2 Boosts damage by 20% of foe's Atk. If in combat against a dragon foe or beast foe, boosts damage by 40% instead of 20%.

Atk/Spd Push 4 At start of combat, if unit's HP ≥ 25%, grants Atk/Spd+7, but after combat, if unit attacked, deals 5 damage to unit.

Chill Spd/Res 2 At start of turn, inflicts Spd/Res-5 on foe on the enemy team with the highest Spd+Res total through its next action.

Ground Orders 3 At start of turn, grants the following status effect to adjacent infantry, armored, and cavalry allies for 1 turn: "Unit can move to a space adjacent to any ally within 2 spaces."

Summer Byleth (F)'s Duo Skill Effect

Duo Skill

Grants【Desperation】to unit and allies within 2 spaces. At start of every third turn, if Duo skill has already been used, unit can use Duo Skill again. 【Desperation】 Grants the following effect for 1 turn: “If unit initiates combat, unit can make a follow-up attack before foe can counterattack.” (Duo Skills can be used once per map by tapping the Duo button. Duo Skills cannot be used by units deployed using Pair Up.)

Standard Effect 1

Duel
If unit is 5★ and level 40 and unit's stats total less than 185, treats unit's stats as 185 in modes like Arena. (Higher-scoring opponents will appear. Stat total calculation excludes any values added by merges and skills.)

Summer Byleth (F) Best IVs

Recommended IVs

Stat	Superboon/Superbane	IV Recommendation
HP (18)		★★★☆☆
Atk (22)		★★★★☆
Spd (12)		★★★★★
Def (3)		★★★☆☆
Res (4)		★★☆☆☆

◯ = Stat gains +4 with a superboon, ✕= Stat goes down by -4 with a superbane, - = No assets or flaws

See the IV Checker for All Units

Trait Fruits—How to Change IVs

When using an Ascendant Floret, we recommend getting the next superboon if it fits the hero. If not, consider what stat your hero needs most.

+Spd/-Res

The best IVs for Summer Byleth are +Spd and -Res. A higher Spd stat allows Byleth to get a ton of follow-up attacks on her foes. Additionally, her Spd is a superboon so you should take advantage of that as much as possible. Another reason why you should take a Spd boon is that her weapon effect relies on her having a high Spd stat. Her Res is of less importance as she is mainly an offensive unit so it is safe to take as a bane.

+Atk for a +10 Merge

We recommend a +Atk IV when merging Summer Byleth to 10. At +10 Merges, Byleth's Spd will reach such high levels that pushing it up higher is a waste. At this point, it would be better to opt with a +Atk IV instead to help her deal more damage with the follow-up attacks she scores.

Summer Byleth (F) Best Builds

Windsweep Summer Byleth (F)

HOT
： Sun's Percussors ： Reposition ： Ruptured Sky ： -	： Atk/Spd Push 4 ： Windsweep 3 ： Panic Smoke 3 ： Swift Sparrow 2 ： -

How to Use, Explanation

This build utilizes the connection between Summer Byleth's weapon and Windsweep, allowing her to ignore Windsweep's drawbacks but still granting the counterattack negation portion of the skill.

Budget Summer Byleth (F)

： Sun's Percussors ： Reposition ： Ruptured Sky ： -

： Atk/Spd Push 4 ： Chill Spd/Res 2 ： Ground Orders 3 ： Swift Sparrow 2 ： -

How to Use, Explanation

This makes use of Summer Byleth (F)'s base kit. It is very effective in offensive engagements despite the minimal investment. If you need more firepower, you can get Spd/Res Rein 3 in the C slot!

Arena Summer Byleth (F)

HOT
： Sun's Percussors ： Harsh Command+ ： Ruptured Sky ： -	： Atk/Spd Catch 4 ： Windsweep 3 ： Atk/Spd Menace ： Blade Session 3 ： -

How to Use, Explanation

This is an Arena build with premium high-scoring skills used without harming performance. Atk/Spd Catch 4 is the best A skill as it provides the highest damage output.

Source Heroes for All Skills

Summer Byleth (F) Stats

Stat Rankings

Neutral Stats at Lv. 40 (5★)
155
HP	40	Rank: 419/1089
Atk	36	Rank: 480/1089
Spd	42	Rank: 96/1089
Def	16	Rank: 914/1089
Res	21	Rank: 786/1089

Stat Values

Lv 40+10 Stats (5★)

	HP	Atk	Spd	Def	Res	Total
+10 Merges W/ Skill Bonuses	45	55	47	20	25	192
Lv.40 +10	45	41	47	20	25	178

Stats at Lv 40

	HP	Atk	Spd	Def	Res	Total
5★- Adjusted for Skills	40	50	42	16	21	169
5★ Lv.40	40	36	42	16	21	155

Initial Stats (with Skills)

	HP	Atk	Spd	Def	Res	Total
5★ Lv.1	18	22	12	3	4	59

Stat Comparison of Similar Heroes

Hero	HP	Atk	Spd	Def	Res	Total
Spring Chloé	40	43	47	22	26	178
Zephia	41	40	44	23	24	172
Ninja Camilla	38	43	19	32	40	172
Bridal Sophia	38	40	19	36	34	167
Constance	39	42	40	17	29	167
Scion Julia	39	42	35	16	35	167
Thief Leila	40	38	43	20	25	166
Summer Byleth (F)	40	36	42	16	21	155
Adrift Camilla	36	37	30	17	30	150
Aversa	42	33	34	17	24	150
Summer Tana	35	33	36	20	25	149
Halloween Nowi	34	34	32	20	27	147

Note: Stats bonuses from skills are not taken into account.

Summer Byleth (F) Roles, Strengths, and Weaknesses

Summer Byleth (F) Roles

Byleth - Fell Star's Duo Roles
Close-Physical	Ranged-Physical	Close-Magic	Ranged-Magic
Physical Wall	Magic Wall	Effective Weapon	Movement Assist
Exclusive Skill	All-Range Counter	Recovery	Refresher
Legendary	Mythic	Duo / Harmonized	Resplendent

Summer Byleth (F) is a ranged magic attacker (range = 2). Therefore, when not accounting for the Weapon Triangle, the amount of damage she deals will be equivalent to her Atk minus the foe's Res stat.

Duo Skill Usable in Arena

Summer Byleth (F)'s Duo Skill raises her arena score, in addition to unleashing a powerful battle effect. Duo Heroes have a Duo Skill which can be used once per map. Additionally, her Duel effect treats her stats as 185 in Arena modes, giving her a huge advantage over many other heroes.

The effect of Byleth's Duo Skill is shown below

Her Duo Skill grants her and all allies wihin 2 spaces of her Desperation. It is pretty similar Desperation 3 as it allows for the follow-up attack to come before the foe's counterattack, but this status does not require for an HP requirement.

You can read the in-game text for Summer Byleth (F)'s Duo Skill and the duel component in this section!

Summer Byleth (F) Strengths

Access to a Duo Skill

As discussed above, Summer Byleth (F) has access to a duo skill that grants her and her allies the effects of Desperation without a HP requirement. After the first use, you can use it again at the start of every third turn. It has lots of strategic value especially when timed right as it can potentially allow your units to take out priority targets without taking damage.

A Slot Skill gives massive bonus to Atk/Spd

Summer Byleth (F) has the A slot skill Atk/Spd Push 4, which grants Atk/Spd+7 so long as her HP is at or above 25%. It will inflict damage on Summer Byleth (F) after battle, but considering a higher Spd allows Sun's Percussors to disable guaranteed follow-up attacks, this large buff is worth it.

Sun's Percussors

Sun's Percussors does a Spd check at the start of combat and if Byleth's Spd is greater than the foe's, it grants the following effects:

1. Grants +5 Atk/Spd to Byleth. This means Byleth is guaranteed a follow-up attack as long as she has 1 Spd more than her foe.
2. Neutralizes effects that guarantee foe's follow-up attacks like Vengeful Fighter 3
3. Neutralizes effects that prevent Byleth from scoring follow-up attacks like Wary Fighter 3

These effects also kicks-in regardless of Byleth's Spd if the foe is at 100% HP.

Additionally, Sun's Percussors also accelerates Byleth's special trigger by 1 count.

Summer Byleth (F) Weaknesses

Weak to bows

As a flying unit, Summer Byleth (F) takes 1.5x damage from bows and weapons effective on flying units. Be sure to keep them out of the range of archers and leave them to other units.
Heroes with Effective Skills

Summer Byleth (F) Team and Counters

Teammates for Summer Byleth (F)

Plegian Dorothea	Peony	Brave Hector	Reyson
Triandra	Brave Ike	Brave Edelgard	Leanne

Refresher-assist units that can boost Summer Byleth (F)'s offensive output

The Álfr, Peony, Triandra, Plumeria, Mirabilis, are examples of refresher-assist units that greatly boosts Summer Byleth (F)'s damage output. They also possess flying movement, so they will never be out of Summer Byleth (F)'sreach. It is always a good idea to pair Summer Byleth (F) with them especially in Aether Raids whether it would be on defense or offense. Some players find it hard to read defense units' behavior when refresh abilities are added into the mix.

Reyson or Leanne

Reyson and Leanne provide both heals and refreshes to Summer Byleth (F) so she can brawl it out in the frontlines for much longer.

Plegian Dorothea

Plegian Dorothea can refresh Summer Byleth (F) two times in one turn through her Harmonized Skill as they are both from the Three Houses title. Consider using her when running Byleth as this can win you many maps! The downside to this though his her sharing the niche of being a flying red tome user. Make up through diverisfying using your other unit slots!

Physical powerhouses, preferably those who are strong against blue units

Since Summer Byleth (F) is a magic unit, she would need some allies to cover units that are strong in absorbing magic damage. Some great ideas are Brave Edelgard,, Brave Ike, or Surtr.

Reyson can be a good choice too if you choose to run Triangle Adept 3 for the sole purpose of covering Summer Byleth (F)'s weakness against blue units.

For blue choices, Brave Hector sets the bar pretty high up for the the best pick.

Summer Byleth (F) Counters

Legendary Dimitri	Reinhardt	Cordelia	Brave Hector
Brave Dimitri	Brave Edelgard	Legendary Claude	Brave Claude

High-powered blue brawlers

Def is Summer Byleth (F)'s weaker stat so blue physical units can easily exploit her. Though her Spd is really good!

Brave Edelgard

Despite being a green unit, Brave Edelgard is strong enough to take on Summer Byleth (F). She is very common in competitive game modes, and her kit focuses on countering tome users like Summer Byleth (F). Watch out for her.

Reinhardt

Reinhardt is of the blue attribute, and while he has to go through Summer Byleth (F)'s decent Res, he can still take Summer Byleth (F) out at good investment levels. He also double strikes regardless of Byleth's Spd because of Dire Thunder's effects.

Res is Summer Byleth (F)'s better defensive stat, but it is still nothing special.

Bow users!

As a flying unit, Byleth has an inherent weakness to arrows. Stay clear of top tier bow units like the Claudes.

Should you Unlock Potential?

Should You Unlock Potential for this Hero?	Cannot Unlock Potential

Byleth - Fell Star's Duo Only Appears as a 5 Star Hero!

Byleth - Fell Star's Duo only appears as a 5 Star Hero. We will include whether or not you should Unlock Potential for Byleth - Fell Star's Duo if a 4 Star version is released!

Unlock Potential Tier List

Summer Byleth (F) - List of Skills

Weapons

Skill Name	Might	Range	Effect	Learned At
Fire	4	2	No Effect	5★
Elfire	6	2	No Effect	5★
Sun's Percussors	14	2	Accelerates Special trigger (cooldown count -1). At start of combat, if unit’s Spd > foe’s Spd or if foe’s HP = 100%, grants Atk/Spd +5 to unit during combat and neutralizes effects that guarantee foe’s follow-up attacks and effects that prevent unit’s follow-up attacks.	5★

Assists

This Hero has no Assist skills that can be learned.

Specials

Skill Name	Effect	Learned At
Dragon Gaze	(Cooldown Count = 4) Boosts Atk by 30%.	5★
Draconic Aura	(Cooldown Count = 3) Boosts Atk by 30%.	5★
Ruptured Sky	(Cooldown Count = 2) Boosts damage by 20% of foe's Atk. If in combat against a dragon foe or beast foe, boosts damage by 40% instead of 20%.	5★

Passives

Skill Name	Effect	Learned At
Atk/Spd Push 1	At start of combat, if unit’s HP = 100%, grants Atk/Spd +3, but if unit attacked, deals 1 damage to unit after combat.	5★
Atk/Spd Push 2	At start of combat, if unit’s HP = 100%, grants Atk/Spd +4, but if unit attacked, deals 1 damage to unit after combat.	5★
Atk/Spd Push 3	At start of combat, if unit’s HP = 100%, grants Atk/Spd +5, but if unit attacked, deals 1 damage to unit after combat.	5★
Atk/Spd Push 4	At start of combat, if unit's HP ≥ 25%, grants Atk/Spd+7, but after combat, if unit attacked, deals 5 damage to unit.	5★
Chill Res 1	At the start of each turn, inflicts Res -3 on foe on the enemy team with the highest Res through its next action.	5★
Chill Spd/Res 1	At start of turn, inflicts Spd/Res-3 on foe on the enemy team with the highest Spd+Res total through its next action.	5★
Chill Spd/Res 2	At start of turn, inflicts Spd/Res-5 on foe on the enemy team with the highest Spd+Res total through its next action.	5★
Ground Orders 1	At start of turn, if unit's HP = 100%, grants the following status to adjacent infantry, armored, and cavalry allies for 1 turn: "Unit can move to a space adjacent to any ally within 2 spaces."	5★
Ground Orders 2	At start of turn, if unit's HP ≥ 50%, grants the following status to adjacent infantry, armored, and cavalry allies for 1 turn: "Unit can move to a space adjacent to any ally within 2 spaces."	5★
Ground Orders 3	At start of turn, grants the following status effect to adjacent infantry, armored, and cavalry allies for 1 turn: "Unit can move to a space adjacent to any ally within 2 spaces."	5★

Summer Byleth (F) as a Source Hero

Value of Skills	★★★★★

Inheriting Ruptured Sky or Atk/Spd Push 4

Summer Byleth (F) can be used to inherit Ruptured Sky or Atk/Spd Push 4. If you are able to inherit Atk Spd Push 3 from another unit, you can get both skills from Summer Byleth (F)! However, Summer Byleth (F) is a powerful special hero whom you can only get from specific banners. Please think carefully before fodderring her off!

• List of Source Heroes
• The Best Fodder Units

How to Get Summer Byleth (F) / Illustrations / Voice Actor / Quotes

How to Get Summer Byleth (F)

Obtained through a Special Summoning Event!

Summer Byleth (F) is a limited time Hero who can be pulled from a Special Heroes Summoning Event. They do not appear in regular summons.

Note: Not currently a featured hero in any Summon events.

Current Focuses and Which You Should Pull From

Voice Actor and Illustrator Information

Voice Actor (English)	Jeannine Tirado with Cherami Leigh
Illustrator	cuboon
Appears In	Fire Emblem: Three Houses

FEH: Related Guides

Special Heroes: Overseas Memories

Heroes from Special Heroes - Overseas Memories
Summer Byleth (F) [9.0/10]	Summer Ingrid [9.0/10]	Summer Sylvain [8.0/10]	Summer Dorothea [8.0/10]

See All Red Heroes

▶︎Return to the Red Heroes Page

All Types of Red Weapons

Close-Range	Ranged
Sword	Red Tome
Red Breath	Red Dagger
Red Beast	Red Bow