From Warhammer 40k - Lexicanum
Ancestral Crests are prized relics of the Leagues of Votann.
These crests are inscribed with the runes of the great Ancestor Cores, and it is only bestowed upon a wearer in times of great need to a legendary warrior whose skill has been proven in battle. It is said that the crest acts like a mobile Fane, a node through which the wisdom and gestalt power of the Votann flows. It is a great honor and responsibility to bring such an artifact to war, and should the bearer fall in battle it is said the Votann themselves will wreak their vengeance upon the foe..
- 1: Codex: Leagues of Votann, pg. 64