Floating purple spheres suddenly appeared one day, the people were amazed, scared, shocked.. But until one day.. these spheres started falling from the sky and hatched.. turns out they were blood sucking aliens, with tentacles.. these spheres are attracted to loud noises Spheres can't be killed easily, normal bullets only slow them down but won't kill them, but somehow depleted uranium ammunition can kill them.. but it's only effective to the little ones, the big spheres are immune