Aster

Aster was once the royal scientist and has now been banished to the Void after an accident in the CORE.

Backstory
Aster worked hard as a dragonet and quickly became the royal scientist after his mentor died. He earned a reputation as one of the most brilliant dragons in the Underground and began training a dragonet named Starflight as his apprentice. Shortly afterwards, King Arctic and Queen Foeslayer asked for Darkstalker to be split into two halves (Peacemaker and Dusklight) and for him to conduct further research on breaking the Barrier.

Aster agreed and quickly began work. He tried unsuccessfully to replicate Clearsight and Fathom's souls several times before turning his attention to Darkstalker. He was able to seperate Darkstalker into two different dragons; however, one of them had no soul. In an attempt to take small pieces of Clearsight and Fathom's souls and combine them into one, he killed them both.

Several hours later, Peacemaker, one of Darkstalker's halves, killed King Arctic and disappeared. A panicked Aster fully realized what he'd done and began searching for Peacemaker. While looking in the CORE, Peacemaker appeared behind him, and after a brief struggle, Aster was pushed into it. He was sent to the Void, where he went insane out of loneliness and guilt.