Sarkalla

Sarkalla was a crazy Red Wizard of Thay in Doomvault dungeon in 1486 DR.

Personality
Sarkalla, in a word, was mad. Her main objective was to create a truly sentient ooze in order to use it as a "perfect assassin". She was greatly proud of her Ooze Master, and considered it her crowning achievement.

History
Sarkalla was a transmuter assigned to the secret complex of Doomvault located under Thaymount. She was tasked with the mission of creating a perfect assassin and she decided that the best way was create a sentient ooze. In time Sarkalla had success only fusing humans and ooze, creating the Ooze Master. Heroes from Daggerford fought with her wight minions, but after they destroyed the wights they were proposed a truce. The offer included using the heroes as bodyguards and assistants of the Ooze Master.

Behind the Scenes
Sarkalla's madness can be used in order to made appear that the adventurers agreed to serve the Ooze Master but with no intention to fulfill the oath.