In 2001, Fiegel began working with Jerry Grayson of Khepera Publishing on the second edition of that company's GODSEND Agenda (2001), a superhero role-playing game set in the modern world.
[1]: 430 Fiegel later co-wrote and co-designed Khepera's HELLAS: Worlds of Sun and Stone (2008) alongside Grayson.
[2] He also authored the Baba Yaga: The First Setting in Rassiya electronic RPG supplement for Dog Soul Publishing, which won a 2006 Gold ENnie award for Best Electronic Book and was nominated for Best Writing.
[3] Fiegel has worked as a writer for two MMORPGs: Perpetual Entertainment's Gods & Heroes: Rome Rising,[4] and NCsoft's Aion: Assault on Balaurea.
[5] He was also the lead writer for the sci-fi-themed interactive fiction game The Away Team.