Age of Conan - Class Preview @ Official Site

Funcom sheds some light on the Lich class at the official Age of Conan site.

Of all the mages the Lich is perhaps the most feared by the ordinary travellers. Where the Necromancer animates the dead, the Lich actually embraces and joins the dead, becoming one with the foul and decaying undead they can channel great power from by their sacrifice of parts of their mortal soul and body.