not sure if it is this mod adding a special atronach named 'thunder' near atronach stone . but I have not installed any monster mod, so i take my chance here. Put simply, it's insane, and killed everyone in darkwater cross within a blink, won't that be too much? I'm always a hardcore player, and quite like most of the features in this mod,but it's seriously lacking of balance, to a point of a saddist .
Dont fight him then.LEarn to be better at combat,then kill some tough enemies and take there equipment and then try thunder on again.I just entered a cave with a poison spitting bug that was wiping me out even with a potion of poison resistance.I left after 3 tries. 
Edited by wolfstriked, 16 November 2013 - 10:26 PM.