the jenkinverse is a super cool collection of stories (you can find them on reddit) about humans that find themselves amongst aliens, but because the Earth is what is considered a Death World, humans are a lot stronger and faster than aliens. Humans are, to put it simply, the monsters aliens had never even thought existed. (aka humans are space orcs, the second (?) story, Humans don't make good pets, is the best I think. They are all very good)