Lich (Oblivion)

Lichs are found in Northern regions and in dungeons. They float around rather slowly, and usually carry staffs, like Staff of Fatigue or Staff of Ice Storm. They can summon monsters, like skeletons and zombies. They have a rather high resistence to physical attacks, even at higher levels. However, if you have protection from their spells, you will be fine, as they are otherwise quite weak.