Berczerk 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.

Berczerk is larger than the average Shadow Rancor 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 Shadow Rancor.

Berczerk has typical coloring and physical appearance for a Shadow Rancor.

Berczerk has an indomitable resilience when it comes to facing adversity or challenges. They will stand their ground even if outnumbered or up against an otherwise intimidating threat and never back down from a fight.