[Tanthallas]

Effect: Firefist

Gives me +2 attack without Grim Aura on.

Gives me +1 attack with Grim Aura on.

Lvl 60 ogre warrior.

As far as I understand, it is supposed to add 10 attack?

Per the wiki: Increase ATK by 5 (L9) to 10 (L18).