Which ending in Fallout New Vegas is canon?. Introducing my homebrew DND 5e Fallout New Vegas Player's Guide, featuring 120 pages detailing the backstory of the Mojave, 13 unique classes, and. Forums: Index Fallout: New Vegas general discussion Which Ending is Cannon? I guess I'm asking this question WAY too early, but I kinda. Fallout: New Vegas > General Discussions > Topic Details. Does anyone know what the canonical ending for New Vegas is?.