ToME: the Tales of Maj'Eyal

I'm playing a Doombringer right now, and after a lua error when trying to cast Cauterize Spirit from my hotkey bar, my Doombringer apparently started hurting themselves. Casting Abduction on a popcorn enemy takes off a third of my hitpoints. There's no indication in the combat log about the enemy getting in an attack, but there is something about my character stealing life from themselves.

Also, my character apparently has 100% All Damage Penetration, and over 1000 APR, so I don't know if maybe there's some bug with some of the effects you get from some spells (like temporary damage penetration from Reckless Strike, or Cauterize Spirit draining HP) stacking and lingering?