Hello, thanks again for your feedback.
I wasn't able to reproduce the bug where the party failed to load, but I removed some bugs that could be related to it.
I also implemented magic damage correct, now the mage class's attack will benefit only from magic damage & increased magic damage, it can still critical hit like normal attacks and so on.
The following monsters now also use magic attacks:
-Slime
-Dragon
-Beholder
-Djinn
I hope this fixes your problem, if you happen to have it occur again, please try to remember if you attacked using the leaderboard or used the "matchmaking" raid option, what dungeon you attacked, if you won or lost, all of this info can be used in tracking down the bug.
Have fun playing!