There’s a trait called Rocky Death which summons a Duststorm when an enemy dies.
I think renaming it Gritty Death would be more fitting. Grit is smaller than rocks, bringing it closer to dust from the Duststorm.
A rocky death sounds weird to me. The first three things I think of when I hear “rocky” are roads, ice cream, and marriages.
A gritty death sounds like a grizzly death.