Xe's an Outsider, an Outer God perhaps, one who'd intruded upon existence from a place outside conception
Its attacks aren't attacks—they're intrusions, merely a byproduct of something axiomless intruding existence where everything's defined by axioms
This includes any slashes that appear in 相手
相手 can try to bypass/transcend—but ultimately, just Xe's maddening ineffability proves unassailable