Every aspect of him and the Heart focuses in on their spell when it hurtles towards him - it is Void-charged and dangerous in a way that drives him to flee out of its way as if the single spell would break him into pieces. And perhaps it would not - but it would do unacceptable harm.

Grimm cuts off early, flames fizzling as he launches backward off the platform and pulls his wings about him and vanishes again, Shade Soul missing close behind. Too close; the Heart is pounding at him -

(at the Lord of Shades, too, announcing and insisting its affront that the being that swallowed the Radiance would dare to come for the Nightmare now)

- it is drawing him down to chase the streak of inky black as it tries to find some breathing room. He must allow it no quarter.

Grimm whips into being directly over the Lord of Shades, wraps his wings into a point, and plunges.