Leothoryvos

Leothoryvos is the name of the lion-like alien race in Ben 20. The Omnitrix's DNA sample of a Leothoryvos is named Sion. The species formerly lived on and origined from Thorovosia. But, after its destruction caused by the Transylians in the Intergalactic Civil War a long time ago, they were moved by Plumbers and Electromechs to a new and safer planet called Vrychtmosia.