Bleach: Hollow Flash

It'd be cool if the Emperor could be able to have a secondary spirit weapon in the form of Yhwach's Sankt Bogen. It could be listed as a technique in the fighting tab to summon a large bow with a limited number of giant holy arrows to fire.
Or it could be the Emperor's default spirit weapon, working the same way as before only this time when the arrows hit an object it stuck there and allowed the Emperor to passively pick it up as a reiatsu based melee weapon just by walking by it.