Princess Cave: Alicorn of Peace
Looks like Cave got transformed into an Alicorn. He must have found some jewelry lying around and put it on. Not knowing that the jewelry has special powers that would transform him. It has also opened up a portal to Equestria too!

So he hops into the portal and it closes shut right behind. His new purpose is to keep peace amongst all ponies. Giving them guidance to friendship. To keep them from arguing and fighting with each other, especially Princess Luna and Princess Celestia. His castle would probably a Classic Retro Lava Lamp (gold top and bottom with red goo) too. hehe

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