Professorial Guide
Closed Open Gleam Closed Gleam Open
Weapon type
Might	14
Range	2
Required	Thoron Shine
SP	400
Exclusive?	Yes
String ID	SID_師の授けの書
Numeric ID	2890
Description	Accelerates 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."

Effects

Effects	Targets	Conditions
Base weapon
Permanent effects
Max cooldown count-1	Unit	—
Combat effects
Atk/Spd/Def/Res+5	Unit	Player Phase or an  Ally is within 2 spaces
Neutralizes "Special cooldown charge -1"
Neutralizes "Special cooldown charge +1"	Foe
Neutralizes "Special cooldown charge -1"	Allies within 2 spaces	—
Neutralizes "Special cooldown charge +1"	Foes of  Allies within 2 spaces
Refined weapon
Permanent effects
Max cooldown count-1	Unit	—
Combat effects
Atk/Spd/Def/Res+5	Unit	Player Phase or an  Ally is within 3 rows or 3 columns centered on  Unit
Reduces damage by 30% from  Foe's first attack (including second attacks)
Neutralizes "Special cooldown charge -1"
Neutralizes "Special cooldown charge +1"	Foe
Atk/Spd/Def/Res+4	Allies within 3 rows or 3 columns centered on  Unit	—
Neutralizes "Special cooldown charge -1"
Neutralizes "Special cooldown charge +1"	Foes of  Allies within 3 rows or 3 columns centered on  Unit
Skill refine effects
Combat effects
Atk/Spd/Def/Res+X (max: 11) X = 2 x  Allies within 3 rows or 3 columns centered on  Unit, + 5	Unit	Unit's HP ≥ 25% at start of combat
Boosts damage by X% X = 20% of  Unit's Spd
Neutralizes "Reduces damage by X%" per  Unit's offensive Special	Foe

Notes

• "If unit initiates combat" means if the user starts combat during the player phase. The unit does not need to deal damage, nor be the first to attack.
  • However, if the effect is applied after combat, the unit must also survive it to fulfill this condition.
• The stat boost that can be applied during combat by Professorial Guide is considered a temporary buff.
• Professorial Guide will neutralize the "Special cooldown charge +X" effect on foes from effects such as  Heavy Blade 4,  Special Cooldown Charge +1, or the Grand Conquests  Infantry area effect.
  • Since the "Special cooldown charge +X" effect will be neutralized on foes, Professorial Guide will also stack with the "Special cooldown charge -X" effect inflicted on the foe from effects such as  Guard Sword+,  Guard, or  【Divine Vein (Vert)】, unless the foe is equipped with skills that neutralize the "Special cooldown charge -X" effect on unit.
• Professorial Guide will neutralize the "Special cooldown charge -X" effect on unit from effects such as  Guard Sword+,  Guard, or  【Divine Vein (Vert)】.
  • Since the "Special cooldown charge -X" effect will be neutralized on unit, Professorial Guide will also stack with the "Special cooldown charge +X" effect on unit from effects such as  Heavy Blade 4,  Special Cooldown Charge +1, or the Grand Conquests  Infantry area effect, unless the foe is equipped with skills that neutralize the "Special cooldown charge +X" effect on unit.
• The cooldown charge neutralization effects of Professorial Guide will not apply to the user's allies if the user is inflicted with  Time's Grip, the user's allies are inflicted with  Feud, or the user's allies are in combat against a foe with skills such as  Impenetrable Void and  C Feud 3.

Upgrades

Icon	Stats	Description	Cost
	—	Accelerates Special trigger (cooldown count-1). If unit initiates combat or if there is an ally within 3 rows or 3 columns centered on unit, grants Atk/Spd/Def/Res+5 to unit, reduces damage from foe's first attack by 30% (for standard attacks, "first attack" means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes), and neutralizes effects that grant "Special cooldown charge +X" to foe or inflict "Special cooldown charge -X" on unit during combat. For allies within 3 rows or 3 columns centered on unit, grants Atk/Spd/Def/Res+4 and neutralizes effects that grant "Special cooldown charge +X" to foe or inflict "Special cooldown charge -X" on ally during their combat. At start of combat, if unit's HP ≥ 25%, grants bonus to unit's Atk/Spd/Def/Res = number of allies within 3 rows or 3 columns centered on unit × 2, + 5 (max 11) and deals damage = 20% of unit's Spd during combat (excluding area-of-effect Specials), and also, when unit's Special triggers, neutralizes "reduces damage by X%" effects from foe's non-Special skills (excluding area-of-effect Specials).	400 SP,  500,  200
	+2 HP, +1 Mt	Accelerates Special trigger (cooldown count-1). If unit initiates combat or if there is an ally within 3 rows or 3 columns centered on unit, grants Atk/Spd/Def/Res+5 to unit, reduces damage from foe's first attack by 30% (for standard attacks, "first attack" means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes), and neutralizes effects that grant "Special cooldown charge +X" to foe or inflict "Special cooldown charge -X" on unit during combat. For allies within 3 rows or 3 columns centered on unit, grants Atk/Spd/Def/Res+4 and neutralizes effects that grant "Special cooldown charge +X" to foe or inflict "Special cooldown charge -X" on ally during their combat.	400 SP,  500,  200
	+2 HP, +2 Spd	Accelerates Special trigger (cooldown count-1). If unit initiates combat or if there is an ally within 3 rows or 3 columns centered on unit, grants Atk/Spd/Def/Res+5 to unit, reduces damage from foe's first attack by 30% (for standard attacks, "first attack" means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes), and neutralizes effects that grant "Special cooldown charge +X" to foe or inflict "Special cooldown charge -X" on unit during combat. For allies within 3 rows or 3 columns centered on unit, grants Atk/Spd/Def/Res+4 and neutralizes effects that grant "Special cooldown charge +X" to foe or inflict "Special cooldown charge -X" on ally during their combat.	400 SP,  500,  200
	+2 HP, +3 Def	Accelerates Special trigger (cooldown count-1). If unit initiates combat or if there is an ally within 3 rows or 3 columns centered on unit, grants Atk/Spd/Def/Res+5 to unit, reduces damage from foe's first attack by 30% (for standard attacks, "first attack" means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes), and neutralizes effects that grant "Special cooldown charge +X" to foe or inflict "Special cooldown charge -X" on unit during combat. For allies within 3 rows or 3 columns centered on unit, grants Atk/Spd/Def/Res+4 and neutralizes effects that grant "Special cooldown charge +X" to foe or inflict "Special cooldown charge -X" on ally during their combat.	400 SP,  500,  200
	+2 HP, +3 Res	Accelerates Special trigger (cooldown count-1). If unit initiates combat or if there is an ally within 3 rows or 3 columns centered on unit, grants Atk/Spd/Def/Res+5 to unit, reduces damage from foe's first attack by 30% (for standard attacks, "first attack" means only the first strike; for effects that grant "unit attacks twice," it means the first and second strikes), and neutralizes effects that grant "Special cooldown charge +X" to foe or inflict "Special cooldown charge -X" on unit during combat. For allies within 3 rows or 3 columns centered on unit, grants Atk/Spd/Def/Res+4 and neutralizes effects that grant "Special cooldown charge +X" to foe or inflict "Special cooldown charge -X" on ally during their combat.	400 SP,  500,  200

Notes

• The non-Special "reduces damage by X%" effect is calculated after offensive Specials and damage boosting effects such as  Arcane Thorn and  Change of Fate.
  • If an effect such as  Miracle or  Roy: Of Binding's boosted Special effect can trigger, the damage-reduction effect will not trigger and the user will still survive with only 1 HP.
  • Umbra Burst weapons will always deal a minimum of 1 damage even if the foe uses attack damage preventing effects, Invincibility Seals, or damage reduction effects.
  • "Reduces damage by X%" effects stack multiplicatively, unlike interactions related to the weapon-triangle, such as  Triangle Adept and the weapon-triangle advantage boost.
    • For example, if the damage-reduction effects from both  Dodge and  Archrival trigger, the maximum total damage-reduction is 64% instead of 80%, since the two skills reduce the damage to (1 − 40%) × (1 − 40%) = 36% of the original damage.
  • Non-Special "reduces damage by X%" effects can be neutralized or reduced only during combat by effects such as  Share Spoils+ or  Halves non-Special damage reduction.
  • For more information, see Damage calculation.
• The temporary buffs and cooldown charge neutralization effects of Refined Professorial Guide will not apply to the user's allies if the user is inflicted with  Time's Grip, the user's allies are inflicted with  Feud, or the user's allies are in combat against a foe with skills such as  Impenetrable Void and  C Feud 3.

• The damage boosting effect of  Professorial Guide ignores the foe's Def or Res when calculating the damage boost, and can be reduced by damage-reduction effects such as  Archrival,  A/S Rival Break, and  Dodge.
  • Damage boosting effects stack additively, similar to flat damage-reduction effects and interactions related to the weapon-triangle, such as  Triangle Adept and the weapon-triangle advantage boost.
  • A foe equipped with Invincibility Seals will neutralize all sources of damage except from Røkkr area-of-effect Specials and the minimum 1 damage from Umbra Burst weapons.
  • A foe using attack damage preventing effects can neutralize damage dealt from the foe's own attacks and the unit's attacks (Units with Umbra Burst weapons will take and deal the minimum 1 damage).
  • For more information, see Damage calculation.
•  Professorial Guide will neutralize non-Special "reduces damage by X%" effects from Specials such as  Vital Astra.
  •  Professorial Guide will not neutralize Special "reduces damage by X%" effects or flat damage-reduction effects such as  Archrival or  Pair Up 4.
  • For more information, see Damage calculation.

Example of Area of Effect

List of owners

Unit	Skill chain
Byleth: The Fódlan Light	Light 5	Ellight 5	Shine 5	Professorial Guide 5

Gallery

• 
  Sprite sheet for Professorial Guide's animation.

In other languages

See also

• Tempo Passives