Board Thread:Speculation House/@comment-25857155-20150116082950/@comment-26018514-20150218070406

are remnant's of souls actually... which would also explain the name "Remnant", perhaps humanity was sophisticated enough to Terra-form, and experiment in cross-species genetics, needed a new world to survive, found a dead world with all the right elements(Remnant), then had a "dark ages" where their tech was incompatible and they lost all of their history(as well as finding both dust and grimm).