Ring of Blood
The final floor of the Hidden Compound, featuring a slave fight arena. Upon entering you speak with the ringmaster. You can either choose to attack the ringmaster, or to fight in the arena.
Fighting in the arena costs 150 gold per try. You control a low-level Brawler against a series of foes. If you complete all foes, you will recieve the Bloodcaller artifact, and if you have not unlocked Brawler, that class will now be unlocked.