Crow Spirits

The Crow Spirits are grim, cold killers who seem bent not
on piracy but the selective annihilation of humanity within
the Koronus Expanse. Clad in glittering armor that shines
as if filled with moonlight, they make no sound in battle and
are led by witches robed in pale tatters with tall helms of
gleaming bone. Their ships are like pale dead things driven
by a cold and broken will. Their tattered ethereal sails propel
them from the depths of the void to strike at ships, colonies,
and stations in the Foundling Worlds, Accursed Demesne, and
Unbeholden Reaches. Cloaked and unseen until it is too late,
the Crow Spirits are borne on a storm within the warp and
real space that boils and screams with ethereal voices. They
destroy and kill with a cold precision---and then leave, taking
no prizes. Who leads these mysterious Corsairs and what their
purpose is remains unknown, but some have speculated that
they are guarding something, or keeping something from
being discovered. At least one Inquisitor of the Ordo Xenos
believes that they have some tie to a notorious Eldar Corsair in the
Calixis Sector---Ulthyr Ellarion.