It is said that all things that fly in the Warhammer 40k universe revere Sanguinius the primarch of the BloodAngels. There's been a lot of abhuman races missing and even when they're there, the Inquisition treats them as heretics. Still though, a lot of them try to bend to the Imperium of Man and worship the God Emperor as such because it's all they know.

This little vampirebat tries their hardest and I wonder even though they've found the Blade Encarmine, if they'll find the absolution they're looking for.