Once a Chultan paladin, Ras Nsi was a Chosen of Ubtao and sworn protector of the city of Mezro. He later betrayed his oaths and was banished from the city. Becoming a vengeful warlord, Ras Nsi attempted to conquer Mezro with an undead army but was defeated. Rather than seek redemption, he sought revenge and was stripped of his God-given powers. The undead horde, no longer under his control, spread throughout the jungles of Chult.