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[[File:Azrael.jpg|thumb|right|[[Azrael]] wielding the [[Sword of Secrets]].]]The '''Heavenfall Blades''' are [[master-crafted weapon|master-crafted]] [[powered weapon|power swords]] wielded by the highest-ranked members of the [[Dark Angels]] [[Chapter]]. The weapons were crafted using a single block of jet-black obsidian; according to Chapter lore, the block had formed the core of a meteorite that struck [[the Rock]], the Dark Angels' mobile fortress[[Fortress-monastery]], in orbit around the feral worlds of [[Al Baradad]].^1a

The mightiest of these blades is the [[Sword of Secrets]], wielded by the [[Supreme Grand Master ]] of the Chapter (currently [[Azrael|Commander Azrael]]).^1b .  Small portions of the meteoric obsidian were also used to craft the [[Sword of Silence]], wielded by the [[Master (Space Marine)|Master ]] of the [[Deathwing]] (currently Master [[Belial]]),^1c , and the [[Raven Sword]], wielded by the Master of the [[Ravenwing]] (currently Master [[Sammael]]).^1d .  It is said that some of the obsidian was sent to the other [[Unforgiven]] Chapters, so that their highest leaders may wield weapons crafted from this substance.^1a