Corneilius (born October 20th, 1998) better known by his stage name SEALVIR X, is an American underground recording artist and digital creator. He splits his roots and creative foundation between Albany, Georgia and Syracuse, New York.

He crafts an aggressive, deeply reflective, and highly independent sound rooted in modern underground hip-hop. His lyrics heavily emphasize themes of resilience, individuality, isolation, and navigating mental struggles. He often writes about building self-reliance and defiantly moving in his own lane while tuning out fake or untrustworthy energy.