Thunderhead is a Legendary Tome and a weapon skill that appears exclusively in Fire Emblem Heroes.

It is the personal tome of Olwen (Righteous Knight).

Overview[edit | edit source]

Similar in function to a Gronnblade; Thunderhead adds all stat buffs to Olwen's Atk stat before calculating damage. In comparison to the inheritable variation, Thunderhead has increased power and lacks the special trigger delay. In recent updates, it obtained a special refine, giving Olwen a supportive role as a debuffer, inflicting -5 of speed and resistance to foes within 2 spaces of Olwen and her nearby ally, when her or said ally starts combat.

Weapon Stats[edit | edit source]

Name Type


FEH Wind Tome.png Tome

Mt Rng SP Rarity
14 2 400 ✯✯✯✯✯

Adds total bonuses on unit to damage dealt.

Name Cost


400 SP, 500Arena Medal.png, 200Divine Dew.png
Type HP Mt Spd Def Res
FEH WUp 1.png +2 + 1
FEH WUp 2.png +2 + 2
FEH WUp 3.png +2 + 3
FEH WUp 4.png +2 + 3
FEH WUp 101.png If unit or ally initiates combat against a foe within 2 spaces of unit, inflicts Spd/Res-5 on that foe during combat.
Adds total bonuses on unit to damage dealt.

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