Blood
The Chosen believe that it is their blood that sets them apart from other beings. It is in their blood that their semi-divinity resides, derived ultimately from descent—however partial—from a God Emperor. The Chosen believe that, at his Apotheosis, a new God Emperor receives the ‘essence’ of the Twin Gods, transmuting his mortal blood into pure ichor: the divine, burning blood. A child fathered by a God Emperor receives the gift of this ichor intermixed with the blood of its mother.