To make your own instanced dungeon on Lucent Heart, you have to have 3 different Star Cores. One Star Core for Loot, one for the Environment, and one for what Monsters/Boss show up. They can be differentiated by what color they are (red, yellow, blue). Requirements are to be of the dungeon level, or higher, to create one (so, if you’re level 50, you can’t create a level 60 dungeon). You can find the Prophecy Platforms (where you enter the instances) in a couple different places like Breezing Land and Antecear. (I can’t remember the others off the top of my head- sorry!) Hope this has helped you
You’d probably get a faster reply on the Official Beanfun Forums.