Causalim, Forger of Collapse

Causalim are ancient super weapons given form, with a core that's built to mirror a black hole, they charge through space, erasing any traces of civilization they come across, with dense fields of gravity absorbing anything they get close to into themselves, where that mass is eventually repurposed into extensions of itself, once it gets big enough, it will collapse into itself and make a proper black hole until it too collapses in on itself.