Wilderlands Age of Worms
Shadow Servant Lich
If the visions the party saw at Kuluth-Mar are to be believed, this creature whispered the dark secrets that led to Angall’s Folly (i.e., the wizard’s abortive attempt to summon Yog-Sothoth and accidental ascension to godhood). In the visions, they saw him both alive and then undead.
Upon encountering him in the undead flesh, the party refused to listen to whatever secrets he might have to whisper to them and quickly gave him his final rest.