mrtittywinkle said: Is this a reference to Majora's Mask?
No, it's probably a reference to an episode where the village gets attacked by an Ursa Minor, a gigantic bear with a body that looks transparent but filled with stars like the monsters above.
At the end of the episode we learn that Ursa Minors are just babies, and the Ursa Major is the mama bear and is ridiculously huge, even compared to the already gigantic Ursa Minor. The giant bear in the picture above is probably an Ursa Major given it's size.
