By the sheer presence alone, the reaper who held the scythe was able to overpower many of the factions representative in this event of Virtuosic War.
It wasn't enough to defeat them all, but the churning darkness and constant bombardment of a massive area of attack was enough for the Dux, Juujou, Karasaki, and Sisyphus to be on the defensive as they couldn't do another to the figure of death itself.
And with just a single hand, a single course of action, the reaper's currently displayed most powerful attack was stopped by a lone rabbit whose eyes were as pristine as the star.
Until those eyes were lit by a trailing-back blaze of tainting red.
Obviously, everyone in the location was smart enough to not provoke this rabbit, especially since she stopped the attack that was aimed at them.