I just start playing today well it's actually in the middle of the night for me 950pm should really get to bed
I just ran into the enemy is undefined problem on a new save and it happened because of an interaction between Demonic Decay and Embodiment of Baal resulting in the opponent having 0 hp before I could attack and it not ending the battle. After attacking it popped up the enemy is undefined and I couldn't continue. I hade to close the program.