This crystal maintains the existence of Terra Vapos, is a very rare and valuable Crystal and can be found on dragon's body, an very rare creature and almost in extinction. It is extremely rare and almost extinct, and can only be found from the stomach of a dragon. Stork mentions no one has seen Serpergris for thousands of years. There is an ancient den that held the last known deposit of Serpergris, where Finn and Stork retrieve it to save Terra Vapos from their plague.