[2020] Immortal mob in Arena

Unfortunately for a bug like this I would need to see your log file (which is reset each time the game starts). And in the case of arena bugs specifically, it’s useful to know which Arena you were in, what wave you were on, and what your character level was.

Thanks for the extra details-- the bug indeed seems to just be caused by the Renewed Hope node. Consuming Sigils via either the Faith node or Divine Flare node makes this bug happen.