Hi.

I've been upstair and released all the other mage's and attacked Him in his "lab".. Result : the other mages died, Imoen i somehow "diabled" and Irenicus is "near Death" in his tatus bar.. But he will not die!!

Ideas anyone?

No Idea,
Try using spells like cloudkill,
David

when i faught him in there the first time he whipped my ass
but the second time i just stood back and let the other mages do most of the fighting and did whatever i could with my party members from a distance..
keep trying and you'll beat him but fear not! your nowhere near the end of the game

when you weaken him he will warp away ...then you will go on to follow after him ....to defeat him for good you must kill him in nine hells !!! hope this helped

I have the same problem. Jon Irenicus will just lay there are almost dead and not do any thing. No matter what I do he just lays there taking loads of damage....