Grom

Grom is short for Gromethius the Fearbringer. It is the black goop monster Luz noceda and Amity Blight fight in Enchanting Grom fight (ep 16) of the owl house. Grom will shapeshift into the challengers worst fear to get an edge in combat.
Grom is also sometimes used to refer to ep16 of The Owl House

Grom just shapeshifted into amitys worst fear... Which was being rejected by luz

11👍 20👎