In the good old days he just had a few demons, now its a dragon, an elder orb, Saravok and Black Razor then when the dust clears Irenicus transforms into the slayer and kills me.
I can think of two solutions.
1) Drop a bag of holding with some equipment, Bracers, +3 sword etc before the final battle, then re-equip myself.
2) turn into Slayer.
I really don't like 1), very cheesey and a sad way to finish a great game 2) looks like heads he wins tails I win.
Am I missing something obvious?