These are some ideas of what could be added to the arcades.
1. Mini bosses: mini bosses are a kind of how you would think, stronger than the usual monsters but not as strong as a real boss, the will appear while you are randomly exploring the arcade clockworks (think of it as a random event), when defeated they will drop more crowns than the usual monster and perhaps even rarities.
2. Orange Treasure Box: a treasure box that is less common than the others, it has a higher chance of containing an equipment piece than the other boxe's (because im sure most of you have only gotten like 1 piece of equipment from the green boxes right?)
These are my suggestions so far, leave any comments or any of your own suggestions in this thread if you want.
Interesting, I would like to see what your ideas are for random encounter mini bosses.