So why my wife thinks Kaulder is a Lich.
He get's the curse from the Witch Queen and we find that it's really her immortality that she stored in him when he hurt her really badly. Around then in the film we find out that if you destroy her heart you kill her and him if he still has the curse. At the end he kills her again, get;s cursed again, and her heart survives again as he decides to not destroy it and meet his family in paradise as there are meaner and nastier things waiting for him to die and a hot witch wanting to be his protege'/lover (honestly a great decision).
So therefore he has eternal life, can survive any wound, and his only vulnerability is an outside vessel. He has magic, incredible knowledge, wealth, a cause, great fighting skill, and.... a phylactery.
She thinks he's a Lich.