Morbid

Morbid is an untrustworthy, disloyal, back-stabbing double-crosser. The young guardian was banished from her birth clan, exiled into the Scarred Wasteland to fend for herself. Surprisingly, Morbid did quite well for herself. She would occasionally stay with established plague clans that she would later pillage and rob before vanishing into the Wasteland again. Unassuming travelers, particularly non-plague dragons, would encounter Morbid on their journey through the Scarred Wasteland. She would trick them into getting lost with false directions, then double back and rob them, or intentionally guide them into terrible traps where many lost their lives.
She looks down on any non-plague dragons, and treats them unfairly. Her racist habits would soon come back to bite her; one day while wandering the wilderness, she encountered a mysterious magic user with forest-green eyes. Morbid confidently challenged the dragon, knowing that plague dragons held a magical advantage over nature dragons. The guardian vastly underestimated the witch, and became cursed with pustule wounds that would never heal.
Morbid was found in the wasteland, horribly infected with various diseases that she contracted easily through her open wounds and on the edge of death. Morbid was welcomed into Malachite's clan, where Garnet dressed her wounds and nursed her back to strength. Morbid planned to rob this clan once she recovered fully, just like the others, but quickly established bonds with Wheatley. She enjoyed his ruthless tactics and admired his brutality. She saw Wheatley as a figure of strength and endurance-- a true plague dragon, even with his hickory brown eyes. She helped the tyrannous dragon rise to power, and became one of his most loyal followers.
Morbid was a terrifying force to face in battle, and was a key component in many of Wheatley's ventures. The regular pillaging of neighboring clans was something Morbid excelled at, and felt at home with her new allies. When Wheatley fell in battle, Morbid quickly realigned herself with his successor, Forsythia.