It would fit Blood Ravens as well, but I was trying to think of something that went along with the Dark Angel's secretive nature. Why do they gain so much from the relics? What do they mean to them? What history do they have with them? Etc etc.
I actually like that you're thinking outside the box for DA - i.e. not just a damage/mitigation bonus.
Got a few more, just because. Imperial Fists - Siege Masters: Cutting supply lines to a fortress drains the enemies supplies more rapidly, and fortified weapons deal more damage. Salamanders - Flames of the Forge: Master crafted equipment costs less requisition, and flamer weapons are more effective against armor. Iron Hands - The Flesh is Weak: Attacks received while your armor is down have a chance to strike a bionic implant, dealing reduced damage. Raven Guard - On Wings of Death: Deal more damage on impact from assault jumps, and reduced range at which scanners detect you. White Scars - Hit and Run: Shooting a target with a bike mounted weapon increases movement speed for a short time.
ULTRAMARNES- armor bonus when alot of them in one playe Space Wolfs- temporarily melee boost and armor boost
What do you mean, Battle-brother? These relics were 'gifted' to us by grateful battle-brothers from other chapters!
I want ride a bike in jet black Armour. Speaking of bonuses, Dark Angles get a 15% dodge bonus when driving light vehicles, you know due to the jinking.
That actually applies to all bikes now in 6th edition, and is one of the reasons why White Scars are as broken as they are right now.
Space Wolves: 30 second 50% speed/Melee buff Blood Angels: Black Rage -50% damage to all ranged attacks for 30 seconds. Ultramarines- Codex Astartes - all enemy movements shown on radar.