by Tott » August 5th, 2010, 7:21 am
In most fantasy settings a Lich is an undead creature of great power and intellect that has been reanimated by dark magical means. they may have chosen to undergo this process themselves or had the process forced onto them. in life they would have been very powerful magic users or influential leaders; kings, generals etc. in many fantasy settings they are bound to the world by a phylactery and may not be permanently killed until that mortal anchor is destroyed first.
the important thing about a lich (that separates them from most other undead creatures) is their intellect, they have retained or even enhanced the intellect that they had in life. however, regardless of how powerful they are, they may still be pawns of an even greater power.
id always assumed that the Witch King (who was himself a servant of Morcar) was a lich or a lich-like creature.
lich's are almost always depicted as being evil, selfish, power hungry and soulless creatures, obsessed with protecting their own existence and increasing their own power and knowledge. they are usually the leaders or a large undead horde.
a necromancer is a magic user who concentrates on calling the spirits of the departed or raising their bodies for his own purposes. due to many societies views on death and the soul a necromancer is often seen as evil because he 'violates' the remains of the dead or their souls for his own (often selfish) purpose. in a fantasy setting a necromancer is usually considered evil (although not necessaries so) and would have a similar spell set to a lich, although not as powerful as a lich.