You manage, just barely, to block His thrust by means of a
necromatic shield that bends the sword away into an adjacent
plane of the warp. He burns the shield into scorched gossamer
with an angry flash of His eyes. His claws lash in to skin your
face. You hammer Worldbreaker into the deck, bouncing the
debris scattered around you into the air, then, with a nod, hurl
it all at Him like a horizontal rockfall. He throws up a
talismatic barrier with a deft gesture of His clawed hand, and
the psychic ward stops most of it. His sword bats away the
larger chunks that tear through the ward, all except one lump
the size of an anvil, which cracks against His left pauldron,
and knocks Him askew