Possible spoiler:
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As I recall......the game won't show the spell nor the effect of the spell imprisonment by the demi-lich on the game info box. Once you are hit, "bye bye".
I usually tackle him with my berserker/mage, who goes enraged when he turned demi and the rest of my party just sit back and enjoyed the show. While my Crom Faeyr hammers away with Melf's Minute Meteors. (Btw, when you dual wield and cast Melf's Minute Meteors, your character attacks in range with both the meteors and the weapon in your off hand).
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Long live H22A1!!!!!