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 [9.5/10]	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?	・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★

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.

+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
： Sun's Percussors ： Reposition ： Ruptured Sky ： Emblem Celica	： Flared Sparrow ： Resonance 4 ： Soaring Guidance ： Blade Session 3 ： Far Trace Echo

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)

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

： Atk/Spd Push 4 ： Watersweep 3 ： Ground Orders 3 ： Blade Session 3 ： -

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.

Source Heroes for All Skills

Summer Byleth (F) Best Weapon Refine

Effect of Summer Byleth (F)'s Refined Weapon

Exclusive Weapon Effect from Refining (Special Effect Type)
Sun's Percussors	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: 489/1184
Atk	36	Rank: 666/1184
Spd	42	Rank: 217/1184
Def	16	Rank: 1099/1184
Res	21	Rank: 949/1184

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
Rearmed Marianne	37	46	40	16	45	184
Spring Chloé	40	43	47	22	26	178
Hoshidan Summer Nephenee	45	45	47	21	20	178
Ninja Camilla	38	43	19	32	40	172
Zephia	41	40	44	23	24	172
Bridal Sophia	38	40	19	36	34	167
Scion Julia	39	42	35	16	35	167
Constance	39	42	40	17	29	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.

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!

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 [9.5/10]	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