This only happened in wave2 and only on the bro titan and his minions of a level 960 temple.All magic damage attacks we completely ignored no "resisted" or 0 0 0 0 text above the enemies.
This isn't a bug, it's because of Bro's magic damage reducing skill. At those kind of levels it's well over 100%
You're totally right...didn't even notice that. I've gone against a few Bros at around that level, but that's the first time that's happened
Use idol and rot beard in temples - they are surpisingly effective when paired with moon, dman, and dusty.