One of the conquerors of the Nether, the Pumpkin King, is at it again. This time, instead of trying to invade the overworld with his minions, he is sending a diplomatic message of peace and fair competition. He has organized a tournament in his own version of the Mob Arena. To allow people to participate, he delegated two of his emissaries to the spawn of Winthier.
Talk with the Arena Master on the right to enter the Mob Arena, or use the usual command "/ma join". For this event, each boss will drop valuable battle tokens. There are three different qualities: Minor, Major and Royal. They drop from bossses at different stages of MobArena. Once you have your tokens, you can exchange them for awesome prizes by talking to the Arena Master on the left.
So come and join MobArena with your friends so you can collect battle tokens to exchange them for otherwise unavailable in-game items. Rare horses and even Win+ can be purchased. The farther you make it, the higher quality tokens the bosses will drop, so teaming up pays off in any case.