Chromanova

Chromanova is a Grotto Beast from the Grotto Beasts trading card game. It takes the form of some kind of astral furry creature. Its fur displays various pastel colors, as well as starry sparkles. The Chromanova trading card is super powerful so if you have it in your deck you basically win the game. During episode 10, Otto tames this legendary creature and uses it to battle in episode 11 and was supposed to use it in the unreleased finale (Episode 12).

Story
According to the legend, Chromanova appears once every 100 years and is the bane to all evil. It was first described by the ancient Grottoians who saw it leap from the cosmos down to earth. It was later seen by Dr. Sledio, who gives the Gang their beasts in episode one. He informs the Gang of a blinding light out in the honey valley and it happens to be Chromanova, who is immediately drawn to Otto, and becomes a tame in the same episode