Brother Ox makes one unarmed strike against a creature to create an instability within the target's essence that lasts 2d8 days. This instability is harmless unless Brother Ox uses his action to end it early. To do so, Brother Ox and the target must be on the same plane of existence. Brother Ox can use this action again to force the target to make a DC 19 Constitution saving throw. On a failure, the target is reduced to 0 hp. On a success, it takes 55 (10d10) necrotic damage.