I think it would be neat to have an endless survival arena type game area. Make it work sort of like the PVP, where you pay a crown fee to enter.
Maybe have it so you could deposit minerals to pick a certain theme with the same recipes as the regular clockworks themes, or skip depositing and have a theme chosen randomly (always shock/fiend, just to troll players). Then you or a team go in with your regular gear and try to survive endless waves of ever stronger monsters coming at you. They'd be restricted to dropping hearts, capsules, vials, vitapods, and then make it so once every so many waves one drops a token, either a new type of token or maybe a forge/grim/primal token according to the arena theme.
Along with being yet-another-desperately-needed-crown-sink, it would also be a good place to test and refine tactics, like practicing bomb deployment patterns or experimenting with different gear combinations.
i think theres should be no crowns rewards.Only like tokens for surving a wave.First few you will not earn a token.Probally at 4th round you get tokens.First 3 would be a warm up and you can get vitas some capsules from drops.You have to chocie to skip it.Monsters should drop what you said.Excuse me if I have any fail sentences.