Lesser demilich

Lesser demiliches are wiser, older and far deadlier than common liches.

Special abilities
A lesser demilich has damage reduction 15/+5 as well as acid, fire, and sonic damage resistance of 10/-, in addition to 75% cold and electrical immunity. This creature also has most of the usual undead immunities, specifically to critical hits, disease, level drain, ability drain, mind-affecting spells, paralysis, poison, and sneak attacks. However, a lesser demilich does not have the usual undead immunity to death magic. (Probably a bug.) In addition, a lesser demilich is immune to spells of level 3 lower and has +5 turn resistance.

The claw attack of a lesser demilich stuns on-hit. In addition, this creature has the following abilities (with a caster level of 15).

Furthermore, this creature is a a level 21 wizard with the following spells prepared.