[2]: 340 He created the Nightbane setting and was involved in the production of Mercenaries and Pantheons of the Megaverse for Palladium's multigenre RPG RIFTS.
[6][7] Carella had negative experiences with Myrmidon on their business end, and since George Vasilakos and M. Alexander Jurkat of Eden Studios, Inc. were fans of his work, they had talked with Carella about developing a crossover book for Conspiracy X and Witchcraft.
[2]: 340 Conspiracy X supplement sales were dropping by 1998 and so Eden Studios wanted to add more lines to revitalize the business and got an exclusive license with Carella to publish his WitchCraft and Armageddon role-playing games.
[2]: 340 Carella created a simplified Unisystem variant for the Buffy the Vampire Slayer Roleplaying Game (2002) named the "cinematic" system.
[2]: 342 Carella wrote Secret of the Ancients (2003) which was the final volume of the Odyssey adventures series from Eden.