The word "lich" come from a dutch word meaning corpse. The Lich is destingished from other undead such as zombies by several features. Most monsters considered liches choose to become a lich in attempt to prolong life. Liches maintain intellegence after death. Since the procese of animating oneself as a lich reqires powerful magic, many liches must also be mages or necromancers. After reanimation, magical ability not only remains but is often enhanced.