The Tomb of Alruccabah's Bane

Centuries ago a warlock named Falsafa, who derived his power from Alruccabah, used that power to betray Alruccabah in order to possess the Lich's Ember (a gem which is said to be of immense power). Alruccabah cursed the warlock to spend his days as a Deathlock wight charged with protecting the Lich's Ember.