The Mayan (Necropolis) dungeon seems to have an issue..... (Other than the absolutely ludicrous SOT cost of 50 per run)

Going along fine... all 4 allies with full heath or nearly full heath and NO BUFFS on them... so there's no Doom or anything.. then with 1 hit Necropolis kills all 4 at one time.... even though he's a single target hitter.

Alex, Charlotte, KP, Necropolis... all dead in 1 shot.