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Yep, your spell trap seems to be working, you are getting hit by his 9th level imprisonment spell, which is absorbed and replenishes your spell trap spell, which you cast again, etc. repeat step one LOL.
With the few hints above, you should have no problem with his demi lich form, like you said, he loves thoe imprisonment spells, a simple spell immunity will negate those, so you need to find a spell that actually damages him. Melf's meteors work well, but slow. But they will damage him.
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