Oussa

Oussa was a Yuan-ti in the Doomvault dungeon in 1486 DR.

Personality
Oussa was a very devotee of Zehir.

History
Oussa was one of the many Chosen captured by the Red Wizards of Thay and transported to the Doomvault dungeon for experiments. More specifically he was the chosen of Zehir. Oussa was freed from his chains by the heroes of Daggerford but then he realized that they were no Zehir's followers and tried to kill them but ended defeated.