Zhalk

Commander Zhalk is a cambion in the service of Zariel and an optional boss during the Prologue. Zhalk is encountered at the helm of the Nautiloid, where he and his minions fights with Mind Flayers. When the party enters the helm, the combat immediately begins. Though it's not required to kill Zhalk to end the fight, he can be killed and/or disarmed for his unique flaming sword and extra experience.