Wisp

Wisps are aliens in Sonic Colors that were stolen from their home planet by Dr. Eggman to power an extra-terrestrail amusement park. They can give Sonic special powers to help him in the game's levels.

Powers
Each of these Wisps, depending on their color, can give Sonic powers to assist him in the game.

Yellow
Absorbing this color of Wisp will give Sonic the ability to drill underground.