During this time, he was one of the three authors who established the French term for a "munchkin", Gros Bill, from the nickname of an overly powergaming player once in Froideval's group.
[1] His writing contributions include several Advanced Dungeons & Dragons rules and monster manuals in collaboration with Gary Gygax, like Oriental Adventures.
He wrote the scenario of several French videogames, working for Infogrames (Drakkhen) and Cryo Interactive (Dragon Lore series).
Froideval dedicated the Black Moon Chronicles series to Gary Gygax in the last album End of Times through these words:
Cette série est dédiée à E. Gary Gygax, le premier grand rêveur, l'inventeur du jeu de rôle, celui sans qui l'heroïc-fantasy et la science-fiction ne seraient à l'heure actuelle qu'un genre mineur presque oublié.