Captain Cain is who players need to speak to before they can play Barbarian Assault.
He will brief players, introduce them to the game and answer any questions they have about the game. Players must speak to him before they can play Barbarian Assault. When talking to him players also have the option of resetting their wave in Barbarian Assault to wave 1. He will also make players do pushups.
Captain Cain is one of the random people contacted with NPC Contact Lunar spell.