Colosseum

With the Slayer Edition update the Colosseum was remade into a daily event without different difficulties. All arenas have 6 waves and reward 10.000 gold and a cape per character upon completion. As with relics, unlocking a cape for one class does not unlock it for another. There are 18 capes to collect, so it will take 18 days to complete the whole collection if you do it on all of the characters. If you miss a day, you will have to wait until that specific cape reappears as a reward. Players can only join while the host is still in the lobby, not once the Colosseum starts.

Daily Colosseums
The daily Colosseum levels cycle through 18 different level and Summoning Stone combinations. Completing the daily Colosseum unlocks the corresponding cape.