Leatherback is wild by nature, but has had its behavior modified to accept the presence of humanoids by an intervention. It is trained against its wild instincts to accept humanoids. As creature handling goes up, a member can better empathize, train, and manage this creature's behavior. Untrained (+0), this creature will do whatever it wants and one would be helpless to understand why, with its natural disposition taking over. As creature handling skills improve, a member can understand, care for, and better influence this creature with full control achieved with mastery (+5) of creature handling.

Leatherback is larger than the average Purrgil in terms of size and body mass. Their bulkier build can offer better power but often at the expense of the mobility and agility commonly associated with other Purrgil.

Leatherback is an old and combat scarred Purrgil. He is larger in size compared to a typical Purrgil - still falling much shorter than a Purrgil Ultra - to be near one hundred meters long. His skin tone is a deep and dark purple, with yellow markings and red scarring. His eyes glow a sick, bright green color.