Cirisa

 is a priestess of The Scaled Tyrant and leader of the Cult of the Caustic Heart.

Personality
Serissa was capable of seeming very motherly and kind, able to make Calianna feel like she belonged and was loved amongst the Cult of the Caustic Heart. However, Serissa was actually very manipulative and used her skills to convince people to sacrifice innocents to Tiamat.

Calianna said that Serissa was motherly and kind to her, encouraging the cult to treat her as special. She was able to convince her it was the way of the world to kill people - merchants and other innocents - in the Scaled Tyrant's name. Calianna came to realise Serissa and the cult were evil and ran away from them.

Trivia
According to Zeenoth, several expositors of the Cobalt Soul were attempting to locate this individual as a person of interest, though they had the spelling as "Cirisa."