Barbarian Arena Quest/Spoiler

Different levels of the arena host different special boss monsters. Each boss must be conquered consecutively to complete a level. Once one level is fully completed the second can be attempted. Only one person can be into a pit at the time. You are teleported away two squares back if the one who is fighting in the pit next to yours is still fighting. You also have a time limit to master the pit, and in case that time runs out, you're out.

There are so far three levels: Greenhorn, Scrapper and Warlord.