The title says it all, a mini-game or actual PVM where you must fight waves of NPC's solo or with your clan. Every so wave there could be a boss battle with unique drops. It would be different from fight caves, which is set up to get a fire cape, because this would have a different environment with different NPC's. Unique strategies will be needed once you reach higher rounds. Which clan will have the highest wave count, or the longest record time? Besides rare drops, players will receive points, or tokens, that can be exchanged for XP/GP/Gear, etc.