this damned script is so poorly written it is hard to believe that it got through QA. but, this is how i did it..... toggle god mode (tilde key + tgm) then went all werewolf on Mirrak this worked like a champ. Mirrak's health dropped as per the script he went to the kiddy pool and killed a dragon to heal, i went all beasty on him again. back to the kiddy pool for Mirrak, all beasty on him again until the script played out. this should not have to be like this. the script should have accounted for variances and not break so damned easily. of course werewolf will time out so have a weapon handy for the final kill. hope this helps.
