The Demi Lich:

Stats
Level: Wizard 21
Hit Points: 184
Armour Class: 18
Abilities: Str 10, Dex 14, Con 13, Int 23, Wis 14, Cha 12
CR: 28
Alignment: Neutral Evil
Special Abilities: Aura of Fear, Harm Self (Undead), Damage Resistances, Immunities


Description
I think we can all agree that no matter how powerful you are, how many magic items you have that can shoot death rays at your enemies, how many sheets of magically enhanced steel you wear, and how huge your holy sword is, when you see a floating skull with gems in its eyes, you know you're going to have to collect your spleen in tiny evidence bags at the end of the battle.

Source: The Bioware HOTU site

Scary stuff..

Will we start seeing alot of 'How do i beat Kangax.. er.. Demi-Lich?' threads around here?? :D

it'll be time for your Pale Master to make her appearance, then. ;)

V***V