Slon is a purple hog that has green nose and a horn on the top of his head. Slon also wears heavy armour and always carries a spiked shield and an axe as his weapons.
Slon the Rook, together with Kon the Knight, is summoned by Bishop Ladja to kill the main protagonist's father, Pankraz. However, Slon and Kon are unable to kill Pankraz, as a result Ladja threatens Pankraz that he can continue fighting if he doesn't care about his son getting killed, Ladja then had Kon and Slon to brutally beaten Pankraz up before incinerating him with a giant fireball.
Slon is later encountered again in the Talon Tower, where the beast is guarding a Dragon Eye, an item that is needed for the resurrection of Zenith Dragon. Slon then fought the heroes, but is ultimately defeated and killed.