I will have to wait til later to provide more info, like my skill trees, but the general idea is, I have max Wraith Bringer (25% chance) in Arena, 3 waves of spiders came at me at the same time (I funneled them into a narrow pass, my 3 skeletons+golem were blocking the path, so they couldn’t get to me), I hit them with a high speed Rip Blood, and they all nearly died at the same time, which caused the game to stop entirely. I thought I was going to die, but once it picked up, in the top left corner, it said 399 Wraiths (Love the counter now btw), which mauled everything at once until they quickly died.
It might be a one-off, or difficult to reproduce… or maybe the spiders spawned more spiders on death? I couldn’t quite tell in the mess.
Screenshots will come later, thanks for looking into it and prompt feedback.