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Legendary Byleth (F)

Analysis by StanTheWoz
Legendary Byleth (F) - The Fódlan Light

5

Obtainable as a 5 only

Hero Stats

Max Avg Total Stats at Lvl 40
171
HP 40
ATK 39
SPD 43
DEF 23
RES 26

Stat Variations

Level 1 Stat Variation
5★
HP ATK SPD DEF RES
Low 17 8 9 3 8
Middle 18 9 10 4 9
High 19 10 11 5 10

Level 40 Stat Variations
5★
HP ATK SPD DEF RES
Low 36 36 39 20 23
Middle 40 39 43 23 26
High 43 43 46 27 29

IV Sets

Key stats worth increasing through nature if possible.
Complementary stats that matter, but not to the point of picking them over key stats for nature increase.
Relatively worthless stat that can safely be decreased through nature.
HPATKSPDDEFRES

Skill Sets

The Power of God and Anime (Player Phase/Arena Scoring)

Build by StanTheWoz
Recommended
Professorial Guide A Atk/Spd Ideal 4
Alternate: Atk/Spd Boosting A Slot
Rally Up Atk+
Alternate: Positional Assist
B Windsweep 3
Alternate: Watersweep 3
Ruptured Sky C Goddess Bearer
IVs

+Atk or +Spd / -HP or -Def or -Res

SBlade Session 3
Alternate: Atk/Spd Solo 3

Show Explanation/Analysis

Weapon: Professorial Guide

Assist: Rally Up Atk+ / any 400 SP assist / Positional Assist / flexible

Special: Ruptured Sky

IVs: +Atk or +Spd / -HP or -Def or -Res

Passive A: Atk/Spd Ideal 4 / Atk/Spd Boosting A Skill / flexible

Passive B: Windsweep / Watersweep / Lull Spd/Res / flexible

Passive C: Goddess Bearer

Sacred Seal: Blade Session / flexible

  • This build aims to emphasize Byleth’s Atk and Spd to deal high damage on player phase, with the option of running skills to boost Arena score if she’s used in a mode where that matters (Arena, Arena Assault, Mjolnir Strike, Allegiance Battles, etc.)
  • The A skill and seal should boost Atk and Spd. Atk/Spd Ideal is generally the best choice of A, as it provides a guaranteed buff of +7 Atk and Spd as long as the buff from Goddess Bearer is active, and an additional +2 if Byleth is at full HP, which is often easy to maintain if using Windsweep or Watersweep. Blade Session is generally the best seal as it provides up to a +9 boost to Atk and Spd, but other seals like Atk/Spd Solo or Life and Death also work well.
  • If Byleth is used on an arena team, the ideal Assist is any that costs 400 SP, which includes all double Rally+ skills, all Rally Up + skills, Harsh Command+, and so on. The particular choice of rally is not particularly important beyond the scoring. If used in other modes, a positional assist like Reposition is generally the most useful. 
  • Ruptured Sky is the best Special for use in Arena or modes with similar scoring, as it costs 500 SP, the same as other Specials like Blue Flame or Aether, but has a lower cooldown that allows Byleth to activate it on the second attack in any combat she can follow-up attack due to the anti-Guard effect of Professorial Guide. It is also a reliable option for damage in other modes, though there are particular cases where another option like Moonbow would be better, or Luna in conjunct with Flashing Blade seal. 
  • The ideal boon is +Atk or +Spd to boost Byleth’s damage and allow her to more consistently follow-up attack. Any of her other three stats are a good choice of bane. 
  • Windsweep and Watersweep are both good options for B skill. Windsweep allows her to avoid counterattacks from physical units if she outspeeds them, while Watersweep does the same for magical units. The follow-up denying conditions of these skills are negated by the Null Follow-Up effect from Goddess Bearer. Windsweep is more generally useful across modes, as physical units are generally more common, particularly among those with Distant Counter. However, there are a decent number of dragons and mages that are relevant as well, particularly if using Byleth in Arena in Wind season; Watersweep allows her to avoid counterattacks from both Legendary Corrin and Legendary Micaiah, allowing Byleth to potentially KO them while taking no damage. Her base Lull Spd/Res is also a decent option that improves Byleth’s damage and ability to follow-up attack by reducing enemy Spd and Res and negating buffs in those stats. 
  • Goddess Bearer is a fantastic C skill that provides Byleth a +7 buff to Atk and Spd, a teleportation effect in the style of Ground Orders, and Null Follow-Up so long as she starts her turn within 2 spaces of an ally. It also costs 300 SP, so it is ideal for scoring. There is generally no reason to replace it with another skill for this type of build. 

No Guard (Special Charge Support)

Build by StanTheWoz
Professorial Guide A Atk/Spd Ideal 4
Alternate: Atk/Spd Boosting A Slot
Rally Up Atk+
Alternate: Positional Assist
B Windsweep 3
Alternate: Watersweep 3
Ruptured Sky C Goddess Bearer
Alternate: Joint Dist. Guard
IVs

+Atk or +Spd / -HP or -Def or -Res

SDistant Guard 3
Alternate: Drive Atk 2

Show Explanation/Analysis

Weapon: Professorial Guide

Assist: Rally Up Atk+ / any 400 SP assist / Positional Assist / flexible

Special: Ruptured Sky

IVs: +Atk or +Spd / -HP or -Def or -Res

Passive A: Atk/Spd Ideal 4 / Atk/Spd Boosting A Skill / flexible

Passive B: Windsweep / Watersweep / Lull Spd/Res / flexible

Passive C: Goddess Bearer / Joint Dist. Guard / flexible

Sacred Seal: Distant Guard / flexible

  • This build attempts to capitalize on Byleth’s unique support capabilities from Professorial Guide while maintaining some offensive capabilities. 
  • The choice of Assist depends on the mode: for Arena, a 400 SP assist is ideal for scoring. For modes where SP cost is not a concern, such as Aether Raids or Summoner Duels, a Positional Assist is often the most useful choice. 
  • The B skill could be substituted for something like Chill Atk to provide a debuff to a single foe, but the usefulness of this is debatable compared to Byleth’s own combat potential and ability to avoid counterattacks from either physical units with Windsweep or magical units with Watersweep. This can allow her to deal with single annoying units the team might otherwise struggle with, such as Fallen Edelgard when using Windsweep. 
  • The C skill is flexible. Goddess Bearer is a fantastic skill for Byleth’s own combat, but does nothing to help out her allies, so it can optionally be swapped out for something like Joint Dist. Guard or Joint Drive Atk to provide allies within 2 spaces a slight stat boost in combat, or something like Infantry Breath or Infantry Flash for a Special-charge effect specific to Infantry allies. Inf. Hexblade is another decent option that allows adjacent infantry allies wielding a physical weapon to target the lower of the foe’s Def or Res while also boosting their Atk and Spd by 2 in combat.
  • Likewise, the seal can be used to support allies, with Distant Guard being a generally useful option, with many other good choices like Close Guard or Drive Atk

Strengths

Professorial Guide

Professorial Guide is a great weapon that provides the Slaying effect (Special cooldown count -1). In addition, whenever Byleth initiates combat or is within 2 spaces of an ally, it boosts all her stats in-combat by 5, neutralizes the effects of any skills that increase her foe’s Special charge or reduce her own, as well as providing the same Special charge benefits to allies within 2 spaces, sort of a “Drive Null Guard” effect that is largely unique to her. This weapon allows her to function both as a highly effective player phase offense unit, and a somewhat unique support. 

Goddess Bearer

Goddess Bearer is a fantastic C skill that provides a buff of 7 to Byleth’s Atk and Spd whenever she starts her turn within 2 spaces of an ally, as well as providing two status effects with that same condition: Null Follow-Up, and the ability to warp adjacent to any ally within 2 spaces, similar to the effect of Ground Orders

Great Atk and Spd

Byleth’s base 39 Atk and 43 Spd are great and allow her to deal high damage while gaining a follow-up attack against most units, outside of the extremely quick. 

Tome Infantry

Byleth’s status as a tome-wielding Infantry allows her to use some good inheritable skills like Atk/Spd Ideal, Windsweep, and Lull Spd/Res

Wind Pair-Up Legendary

Byleth is a Wind Legendary Hero with the Pair-Up effect, allowing her to Pair-Up with another ally in a limited selection of modes including story maps and Allegiance Battles, boosting her effective Base Stat Total for scoring up to 185, and boosting the HP of allies blessed with Wind by 3 when Wind is in season. 

Weaknesses

Mediocre HP, Def, and Res

Byleth’s base 40 HP, 23 Def, and 26 Res are mediocre and render her vulnerable to being KO’d by powerful counterattacks. While she can avoid some counterattacks by using skills like Windsweep or Watersweep, each one of those leaves some units still able to counter based on weapon type. 

No Blessing Flexibility

Byleth’s status as a Wind Legendary Hero means that she cannot be Blessed with another element. This is a limiting factor in some modes, such as Aether Raids; she will not contribute to a team’s Lift gain unless Wind is in season. 

Competition

While Byleth possesses some unique and powerful effects from Professorial Guide and Goddess Bearer, she competes with many other powerful tome infantry including Legendary Byleth (M) for use on teams in general, and with other amazing Wind Legendaries like Legendary Sigurd for use in Arena in Wind season. She is a great unit, but may not be the best choice for a particular team or role. 

Weapon Skills

Weapons SP Rng. Mt.
Light
Learns by default at 1 ★
Unlocks at 1 ★
Blue Tome Users Only
50 2 4
Ellight
Learns by default at 2 ★
Unlocks at 2 ★
Blue Tome Users Only
100 2 6
Shine
Learns by default at 4 ★
Unlocks at 3 ★
Blue Tome Users Only
200 2 9
Professorial GuideAccelerates Special trigger (cooldown count-1). If unit initiates combat or is within 2 spaces of an ally, grants Atk/Spd/Def/Res+5 to unit and neutralizes effects that grant "Special cooldown charge +X" to foe or inflict "Special cooldown charge -X" on unit during combat.  Allies within 2 spaces gain: "Neutralizes effects that grant 'Special cooldown charge +X' to foe or inflict 'Special cooldown charge -X' on unit during combat."
Learns by default at 5 ★
Unlocks at 5 ★
Non-Inheritable skill.
400 2 14
Weapon Evolution
Weapon Upgrades
Weapon Upgrades

Special Skills

Special Skills SP Turns
Dragon GazeBoosts Atk by 30%.
Learns by default at 4 ★
Unlocks at 3 ★
Non-inheritable by Staff-wielding units.
100 4
Draconic AuraBoosts Atk by 30%.
Unlocks at 4 ★
Non-inheritable by Staff-wielding units.
200 3
Ruptured SkyBoost damage by 20% of foe's Atk. If in combat against dragon foe or beast foe, boost damage by 40% instead of 20%.
Unlocks at 5 ★
Excludes Staff, Dragon and Beast Units
500 2

Passive Skills

Passive Skills SP Slot
Atk/Spd Ideal 1At start of combat, if unit's HP = 100% or if【Bonus】is active on unit, grants Atk/Spd+3 to unit during combat.  【Bonus】 All effects that last "for 1 turn" or "that turn only." Includes bonuses granted by a skill like Rally or Hone and positive status effects (extra movement or effects like Dominance).
Excludes Flying and Cavalry Units
Unlocks at 2 ★
60
A
Atk/Spd Ideal 2At start of combat, if unit's HP = 100% or if【Bonus】is active on unit, grants Atk/Spd+4 to unit during combat.  【Bonus】 All effects that last "for 1 turn" or "that turn only." Includes bonuses granted by a skill like Rally or Hone and positive status effects (extra movement or effects like Dominance).
Excludes Flying and Cavalry Units
Unlocks at 3 ★
120
A
Atk/Spd Ideal 3At start of combat, if unit's HP = 100% or if【Bonus】is active on unit, grants Atk/Spd+5 to unit during combat.  【Bonus】 All effects that last "for 1 turn" or "that turn only." Includes bonuses granted by a skill like Rally or Hone and positive status effects (extra movement or effects like Dominance).
Excludes Flying and Cavalry Units
Unlocks at 4 ★
240
A
Atk/Spd Ideal 4At start of combat, if unit's HP = 100% or if【Bonus】is active on unit, grants Atk/Spd+7 to unit during combat. At start of combat, if unit's HP = 100% and【Bonus】is active on unit, grants an additional Atk/Spd+2 to unit during combat.  【Bonus】 All effects that last "for 1 turn" or "that turn only." Includes bonuses granted by a skill like Rally or Hone and positive status effects (extra movement or effects like Dominance).
Excludes Flying and Cavalry Units
Unlocks at 5 ★
300
A
Lull Spd/Res 1Inflicts Spd/Res-1 on foe and neutralizes foe's bonuses to Spd/Res (from skills like Fortify, Rally, etc.) during combat.
Excludes Armor and Flying units.
Unlocks at 1 ★
60
B
Lull Spd/Res 2Inflicts Spd/Res-2 on foe and neutralizes foe's bonuses to Spd/Res (from skills like Fortify, Rally, etc.) during combat.
Excludes Armor and Flying units.
Unlocks at 2 ★
120
B
Lull Spd/Res 3Inflicts Spd/Res-3 on foe and neutralizes foe's bonuses to Spd/Res (from skills like Fortify, Rally, etc.) during combat.
Excludes Armor and Flying units.
Unlocks at 4 ★
240
B
Goddess BearerAt start of turn, if unit is within 2 spaces of an ally, grants Atk/Spd+7,【Null Follow-Up】, and the following status to unit for 1 turn: "Unit can move to a space adjacent to any ally within 2 spaces."  【Null Follow-Up】 If unit's Spd > foe's Spd during combat, neutralizes effects that guarantee foe's follow-up attacks and effects that prevent unit's follow-up attacks for 1 turn.
Non-Inheritable skill.
Unlocks at 5 ★
300
C

Other Info

Origin
Fire Emblem: Three Houses

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