The Sword of Silence is a revered artefact of the Dark Angels Space Marine Chapter, and in times of need, Belial, the current Grand Master of the Deathwing (1st) Company, wields this famous master-crafted Power Sword. This sword is one of a quadrumvirate of legendary swords collectively known as the Heavenfall Blades, and these formidable weapons are only carried by the highest-ranking members of the Inner Circle of the Dark Angels.
The Chapter's lore states that these blades were forged from the core of a meteorite that struck their mobile fortress-monastery, known as the The Rock, in orbit around the Feral World of Al Baradad. The mightiest of these blades is the Sword of Secrets, carried by the Supreme Grand Master of the Chapter, and the current wielder of that sword is Azrael. The blades wielded by the Grand Master of the Deathwing, the Master of the Ravenwing, and the Master of the Dark Angels' 5th Company also utilise small amounts of the obsidian taken from the meteorite in their working. It is also said that a small portion of this meteoric substance was despatched to each of the Dark Angels' Successor Chapters, so that the senior members of the Unforgiven's own Inner Circles would also bear the same heritage forged in steel as those borne by the Masters of the Dark Angels. The Sword of Silence has traditionally been gifted to the most lethal close-quarters combatant in the Dark Angels. The Sword of Silence seems to swallow nearby light and sound, absorbing them into its glowing obsidian blade.
- Codex: Dark Angels (6th Edition), pp. 56, 92
- Codex: Dark Angels (4th Edition), pp. 42-43
- Warlords of the Dark Millennium: Belial (Digital Edition)