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Btvs.png The subject of this article is of alternative canonicity.
While created as part of licensed material, it is not part of the original Buffyverse, but its own developed story.

Multiverse was the collection of the multiple universes in existence. While it was possible to travel between them, there were creatures known as lurkers that acted like "the multiverse's immune system," patrolling the multiverse under Silas' orders in search of humans outside their universe to kill them.[1]