Byleth (F)
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Fire Emblem Heroes (FEH)
Summer Byleth (F) Builds and Best IVs
★ Latest Banners - New Heroes: Harmonized CYL Ike, Lyn
☆ New Units - Harmonized Brave Ike, Harmonized Brave Lyn, Vanitas
☆ Free Units - N/A
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 | |
|---|---|
 Summer Byleth (F)
|
|
List of Contents
| Legendary Heroes - 35th Anniversary Rising Heroes 2 Featured Heroes | |||
|---|---|---|---|
| Summer Byleth (F) [8.5/10] |
 Valentine's Chrom[9.0/10] |
 Winter Byleth (M)[9.0/10] |
 Emblem Marth[9.0/10] |
 Valentine's Ephraim[8.5/10] |
 Attuned Caeda[9.0/10] |
 Young Robin (F)[9.5/10] |
 Attuned Micaiah[9.5/10] |
 Winter Shez (F)[9.5/10] |
 Emblem Lyn[9.9/10] |
 Legendary Leif[8.5/10] |
 Legendary Claude[8.5/10] |
Summer Byleth (F) Rating and Basic Information
| Overall Rating | 8.5/10 |
|---|---|
| Reroll Ranking (excluding Inherit Skill) |
B (▶Reroll Ranking) |
| Ranking (including Inherit Skill) |
B (▶FEH Tier List) |
Byleth - Fell Star's Duo: Basic Information
| Color / Weapon Type / Move Type | |
|---|---|
| Rarity | |
| What Kind of Character Are They? | ・Refined Sun's Percussors grants bonus stats, Null Follow-Up, offensive Tempo, damage reduction and damage reduction piercing to Byleth, inflicts Scowl onto her foe, and grants nearby allies bonus stats and damage reduction piercing. ・Duo Skill grants Desperation on-demand to herself and nearby allies. |
Summer Byleth (F) Skills at 5★
|
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. |
|
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%. |
|
At start of combat, if unit's HP ≥ 25%, grants Atk/Spd+7, but after combat, if unit attacked, deals 5 damage to unit. |
|
At start of turn, inflicts Spd/Res-5 on foe on the enemy team with the highest Spd+Res total through its next action. |
|
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.
+Spd for a +10 Merge
We recommend a +Spd IV when merging Summer Byleth to 10. At +10 Merges and enough investment, Byleth's Spd will be enough to compete with the fastest metagame foes despite her age and powercreep affecting her compared to modern units.
Summer Byleth (F) Best Builds
Mobile Nuke Summer Byleth (F)
| HOT | |
|---|---|
How to Use, Explanation
This high investment build maximizes nuking power and mobility, allowing Byleth to nuke down an enemy from far away with pre-combat damage and high offensive stats.
Watersweep / Budget Summer Byleth (F)
 ：
-
|
 ：
-
|
How to Use, Explanation
This budget build uses Windsweep to protect Byleth from counterattacks from specific foes while negating its drawbacks with her weapon's innate Null Follow-Up effect.
Summer Byleth (F) Best Weapon Refine
Effect of Summer Byleth (F)'s Refined Weapon
| Exclusive Weapon Effect from Refining (Special Effect Type) | |
|---|---|
| SP: 400 | |
| Might: 14 Range: 2 HP: Accelerates Special trigger (cooldown count-1). At start of combat, if unit's Spd ≥ foe's Spd-5 or if foe's HP ≥ 75%, grants Atk/Spd+5 and Def/Res+4 to unit, neutralizes effects that guarantee foe's follow-up attacks and effects that prevent unit's follow-up attacks, neutralizes effects that inflict "Special cooldown charge -X" on unit, and reduces the percentage of foe's non-Special "reduce damage by X%" skills by 50% during combat (excluding area-of-effect Specials). Grants Atk/Spd+4 and "reduces the percentage of foe's non-Special 'reduce damage by X%' skills by 50% (excluding area-of-effect Specials)" to allies within 2 spaces of unit during their combat. If unit initiates combat or is within 3 spaces of an ally, grants bonus to unit's Atk/Spd/Def/Res = number of allies within 3 spaces of unit × 2, + 4 (max 10) and deals damage = 15% of unit's Spd during combat (excluding area-of-effect Specials). If unit initiates combat, reduces damage from foe's first attack by 50% during combat ("first attack" normally means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes), and also, if foe's attack can trigger foe's Special, inflicts Special cooldown count+1 on foe before foe's first attack (cannot exceed the foe's maximum Special cooldown).  ：500  ：200 |
|
We recommend the Special Effect Refine for Sun's Percussors
Refined Sun's Percussors grants Summer Byleth (F) bonus stats, bonus true damage based on her Spd, a full Null Follow-Up effect, the offensive half of Tempo, 50% damage reduction piercing, 50% damage reduction on her foe's first attack, and inflicts a Scowl effect onto her foe.
It also grants Atk/Spd bonuses and 50% damage reduction piercing to allies within 2 spaces of Byleth, providing support to her allies during their combat.
This refine improves upon Byleth's own combat while providing support at the same time, and is worth using over any other option Byleth can use for her weapon slot.
Summer Byleth (F) Stats
Stat Rankings
| Neutral Stats at Lv. 40 (5★) | ||
|---|---|---|
| 155 | ||
| HP | 
40 |
Rank: 489/1322 |
| Atk | 
36 |
Rank: 666/1322 |
| Spd | 
42 |
Rank: 217/1322 |
| Def | 
16 |
Rank: 1099/1322 |
| Res | 
21 |
Rank: 949/1322 |
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 |
| HP | Atk | Spd | Def | Res | Total | |
|---|---|---|---|---|---|---|
| +HP Lv.40 +10 | 47 | 40 | 46 | 20 | 25 | 178 |
| +Atk Lv.40 +10 | 44 | 43 | 46 | 20 | 25 | 178 |
| +Spd Lv.40 +10 | 44 | 40 | 50 | 20 | 25 | 179 |
| +Def Lv.40 +10 | 44 | 40 | 46 | 23 | 25 | 178 |
| +Res Lv.40 +10 | 44 | 40 | 46 | 20 | 28 | 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 |
|---|---|---|---|---|---|---|
| 37 | 46 | 40 | 16 | 45 | 184 | |
| 36 | 43 | 47 | 16 | 41 | 183 | |
| 40 | 43 | 47 | 22 | 26 | 178 | |
| 45 | 45 | 47 | 21 | 20 | 178 | |
| 38 | 43 | 19 | 32 | 40 | 172 | |
| 41 | 40 | 44 | 23 | 24 | 172 | |
| 39 | 42 | 35 | 16 | 35 | 167 | |
| 39 | 42 | 40 | 17 | 29 | 167 | |
| 38 | 40 | 19 | 36 | 34 | 167 | |
| 40 | 38 | 43 | 20 | 25 | 166 | |
 Summer Byleth (F)
|
40 | 36 | 42 | 16 | 21 | 155 |
| 36 | 37 | 30 | 17 | 30 | 150 | |
| 42 | 33 | 34 | 17 | 24 | 150 | |
| 35 | 33 | 36 | 20 | 25 | 149 | |
| 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
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.
Summer Byleth (F) Strengths
Refined Sun's Percussors has great in-combat effects and provides support
Summer Byleth (F)'s base Sun's Percussors grants Atk/Spd+5 and has a built-in Null Follow-Up effect, allowing Byleth to bypass her foe's follow-up negation effects to maximize her Spd stat.
When refined, Sun's Percussors instead grants Summer Byleth (F) additional bonus stats, bonus true damage based on her Spd, a full Null Follow-Up effect, the offensive half of Tempo, 50% damage reduction piercing, 50% damage reduction on her foe's first attack, and inflicts a Scowl effect onto her foe.
It also grants Atk/Spd bonuses and 50% damage reduction piercing to allies within 2 spaces of Byleth, providing support to her allies during their combat.
This refine improves upon Byleth's own combat while providing support at the same time, and is worth using over any other option Byleth can use for her weapon slot.
Access to a Duo Skill
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.
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
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!
Summer Byleth (F) - List of Skills
Weapons
| Skill Name | Might | Range | Effect | Learned At |
|---|---|---|---|---|
| 4 | 2 | No Effect | 5★ | |
| 6 | 2 | No Effect | 5★ | |
| 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 |
|---|---|---|
| (Cooldown Count = 4) Boosts Atk by 30%. | 5★ | |
| (Cooldown Count = 3) Boosts Atk by 30%. | 5★ | |
| (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 |
|---|---|---|
| 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★ | |
| 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★ | |
| 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★ | |
| 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★ | |
| At the start of each turn, inflicts Res -3 on foe on the enemy team with the highest Res through its next action. | 5★ | |
| 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★ | |
| 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★ | |
| 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★ | |
| 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★ | |
| 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!
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 |
FEH: Related Guides
Legendary Heroes - 35th Anniversary Rising Heroes 2
| Heroes from Legendary Heroes - 35th Anniversary Rising Heroes 2 | |||
|---|---|---|---|
| Summer Byleth (F) [8.5/10] |
Valentine's Chrom [9.0/10] |
Winter Byleth (M) [9.0/10] |
Emblem Marth [9.0/10] |
| Valentine's Ephraim [8.5/10] |
Attuned Caeda [9.0/10] |
Young Robin (F) [9.5/10] |
Attuned Micaiah [9.5/10] |
| Winter Shez (F) [9.5/10] |
Emblem Lyn [9.9/10] |
Legendary Leif [8.5/10] |
Legendary Claude [8.5/10] |
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 |
Comment
1 
cuboon over 5 years
cuboon over 5 yearsI am a fan of cuboon's work. god bless this man. This duo is a close 2nd to Igrene (+10 +Atk btw) #cuboon
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Summer Byleth (F) Builds and Best IVs
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