Sliver X has hacked NES games since 1997. His first released hack was 1998's Final Fantasy Epic, a hack of Gauntlet. Following this was the 1998 release of a Dragon Warrior hack called Dragoon X, which was the precursor to 2001's Dragoon X Omega. (A later patch adding much to the hack was released in 2003)
Sliver X is known for hacking NES music, a feature very few hacks for the NES have at this time.
Sliver X is the administrator of Panicus.org, a site that's home to some of the most talented ROM hackers in the community.