Losing mana i don't remember. But i remember that the wand explodes and kills the 4 or 5 mages. Sine they have all a magical attack, Mystera deducts for each kill piety. If the piety is really low one gets Mystera's wrath multiple times.
dislekcia wrote: Isn't that because you're losing mana to the wand?
Ah, should have clarified that. Like Dreamdancer said, you lose piety because they have magical attack. I clearly remember it saying "Slaughtering Magic Users is not cool" multiple times... though I don't know about losing mana either.
I had a bug with the new fighting interface and a reviving monster (namely "anoobis") : after killing its first form, the tab was still locked on the deceased one, while hovering it showed the correct one (zombie). To be honest, I have not tried to use the fighting interface on the dead form to see what would happen.
EDIT : I have tried again the Creeplight Ruins. There is that behaviour with every cultists. If keep fighting the deceased form with the interface, you get the damages, the zombie remains unarmed.