[@Lumiere]

Err, no so much Lich as " Awakened Undead " Though certainly he could be mistaken for one. He [s]was[/s] is an ancestor to one of a group of adventurers who fell to your BBEG. Before they did of course, adventurers being adventurers and necromancers being necromancers, the party had gone to kill a necromancer who had defiled the tomb belonging to the ancestors of a party member. 

Long story short, when they killed the necromancer, one of the skeletons ( who happened to belong to a long dead, once powerful high king ) decided they liked being alive and developed a sort of " Manacore " of the energy lefover from the Necromancer's death. 

Skele-gramps barely knows anything about who he is, let alone everything he is capable of, though he does know a fair bit about runic magic.