I've gotten Formula: Swift Song lvl 9 - Increases cast speed by +17. I also got a Skeletal Armor Box, which I think is a legion box from the lvl 73+ maps? I also got Clothes Color Dye: Pale Blue. I couldn't use it thought b/c I'm higher than lvl 15 XD
I've also seen ppl getting arena enchants from the Wonder Pockets. My couple got an Waist Enchant: Sorcery Tower, which increases Matk +5%, Cast speed +5%, Mcrit rate +48, and move speed -15% for 5 seconds, stackable up to 5 times.
Pretty cool if you ask me :3