The Crow Father is a daemonic entity of great antiquity, a dark presence that has stalked the galaxy long before Man started digging in the dirt and making little mud houses. It is a parasitic entity that revels in death and destruction, for it is in the aftermath of great calamity that it prospers the most: It delights in pecking away what little remains to those who believe they have lost everything. When all hope and life has fled, it will gleefully pick at the bones and souls of its victims. In a galaxy filled with conflict and hardship there is no shortage of delights for the Crow Father - but he's not above engineering things to be more to his liking.

The 10th Host knows the Crow Father as the (former) patron of the raptor cult - and of course as the great, black wall that protects the so-called Imperial loyalists from directs sorcerous, or daemonic assault. So much for the 'purity' of the enemy. Neither Lorgar nor any of the Deacons have mentioned the Crow Father in particular. There are some indications that Samus may have had dealings with this entity in the past, but getting Samus to comment is notoriously difficult (and you don't really want Samus himself to be the man next to you).