Does multiple aetherfire stacking their damage? Same goes about fetid pool, does it’s vitality damage stacking if multiple pools spawns at the same spot?
Aetherfire is effectively like a BWC/Sigil of Consumption type skill, and those stack so I would say yes.
AFAIK Aetherfire is the sole exeption. It was like that back then, but it was op af (since it has no cd) so they changed it. I might be wrong though.