 Naturally, being paranoid of the unknown as humans often are, they also devised a way to imprison it once it came through.Through experimentation, they learned that these beings, made of aether, a sort of spiritual energy, could fuse themselves with the human mind, possessing and controlling their host if they were able to subvert the human's will.The researchers discovered that a human, once possessed, retained heightened abilities after the aetherial being was purged from them.