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===Powers and abilities===
* Burrowing – Bisaans can burrow into the ground to create their
layer and allow their larvae to safetly gestate until the reproduction cycle begins anew.* Possession – Bisaan possess people by crawling into their mouths and take over control, using their bodies like a hermit crab would a shell. Due to biaans being unable to reproduce themselves, they use the possessed humans to breed every 27 years.* Superhuman strength – Humans possessed by bisaans gain strength that far exceeds when they were human.