He keeps teleporting like crazy and fires death cloud after death cloud. And in between, perfectly healthy characters are kicked into the abyss, if they're too close. Also I have the impression of the game trolling me. They land criticals by the numbers, while my folks land critical misses.
I must have tried it more than 20 times by now. Different tactics, different group. This is really ruining an otherwise great game for me. It's not fun to reload and reload, just to get wasted again.