In the context of video games, "ominous vaults" could be a term from a specific game's lore or mechanics. If you're referring to a game like "The Outer Worlds" by Obsidian Entertainment, where "Chamber 1" and "Pedestal Chamber" might refer to locations in the game, then "Ominous Vaults" could be part of the game's content.
If "Ominous Vaults" are locations or missions that can appear randomly or under certain conditions, it's possible that sometimes they may not be present during playthroughs due to the game's procedural generation or quest design.
To provide a more accurate answer, I would need additional context or details about the specific game you're asking about and the mechanics related to "Ominous Vaults." If you're playing a different game or if "Ominous Vaults" are part of another context, please provide more information so I can assist you better.