She's returned... And he is here to wreak havoc upon the rebels...
Backstory: Onyx was just your typical gem allied with Homeworld. However, the Diamonds figured she had no purpose, so they decided to use her as the vessel to create a rebel-shattering corruption. When the Corrupting Light was unleashed, they made sure Onyx was caught in it. You will know Onyx is here when you hear corrupted humming.
