Seeing the idea about the arena and being kinda similair to WoW gave me a small idea
How about changing monster arena or giving an option so that 1 of the fights are like an actual Raid? Maybe 1 strong ass monster or 1 that summons others (this could be a way to use the unused monsters :3?) as for drops or rewards for killing them that i dont know
Maybe each has a chance of dropping an item quest that gives tt/exp or something like the db quest (ofc it being used 1 time) maybe it can be for higher levels tho
Or maybe they can give an amount of ladder points or maybe drop useful rares, i dunno post some ideas opinions ideas etc