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Make sure you have invisibilty dispel spells ready!
Summon fire elementals (skeleton warriors if Imoen can cast them).
Haste, Protection from evil, remove fear, chant (maybe other protections if you want)on your party and summons. Put the summons in a corner as far from the door as possible. Summon Irenicus and after the talk run away to the corner with the summons. The demons will follow you, kill them with your party. Resurrect and heal the party (summon new elementals if you can) haste again and run to Irenicus, dispel his invisibility and try to dispel his protections (wharding whip/breach) and hit him with everything you have (he regenerates very fast so be careful).
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