The Skull Helm is a helm used by Space Marine Chaplains, a stern visage that evokes the Emperor's wrath. These helms may take many different forms and have been crafted by numerous Space Marine artificers across the galaxy. Universally, however, they are all fearsome and intimidating in aspect. An icon of battle and death, every aspect of it serves as a reminder of mortality's impermanent nature, and thus, the significance of preserving the immortal soul.
- Deathwatch: Rites of Battle, pg. 143