First - what item(?) do you get beating it. I only got staff of a magi and a eye stalk. Did I destroy anyhting during my attack. I only used melee and fireball.
Second:
SPOILER:
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I did the Rune Encounter and I only reloaded once, since my first try was to scout and not to fight. I used Edwin's Mass Improved Invisiblity. This made the Lich's Time Stop useless since his he cant target. I attacked the Beholder first, vampire next and a fighter(?) next. At this moment my invisiblity ran out and I casted Restoration for anybody who got drained. Then Mass invisibilty again. I destroyed the Lich using Pierce and just plain melee. I casted fireball at the female mage at the top. She came down and I also casted Pierce magic on her. Melee- dead. Done. No question just like to share my success