Where to buy the PlatinumPool?

I have collected all the 6 pieces but can't find any option to assemble them in the store, so how to get the PlatinumPool? 🤔

Comments

Misc tab right at the end, there should be a crystal that when you tap on it costs the pieces.

Shady dimension crystal in one of the store tabs, congrats, he auto fights like a beast haha