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Monty and the Keepers were originally from Agartha, also known as the Aether. This dimension is explicitly described to exist outside the multiverse by Monty himself, who further elaborates by stating that Agartha is "the infinite, the realm beyond, beyond perception, etc". It sounds like the Aether is a higher-plane of existence that is beyond perception and trancends the entire Call of Duty multiverse which appears to be infinite in size.