Relics - B

Benedict's Benediction = A special benediction said to grant supernatural protection. 
Black Cross = A mysterious Crucifex that has slowly turned ebony black over the centuries. This is because the Cross is said to be able to absorb the sins of those who lay their hands upon it. 
Blade of Cain = Stories persist of the ancient weapon used by Cain to slay Abel. For an example of the Blade of Cain, see this Link. Such a Relic would surely be of the utmost lethality and those who wielded it would be feared by others, maybe those closest to them. Such is the fate of those who follow in Cain's footsteps. 
Blood of Christ = The medieval era saw a provusion of Relic claims, one of the most popular being vials of Christ's own blood. If such a Relic did exist, the blood within would probably replenish itself daily, and it would be among the most potent Relics on planet Earth. Christ sacrificed Himself to defeat sin and death, so His blood would be the perfect antithesis to those supernatural forces. 
Brick of Babylon = A few of these are still in existence, a surviving brick from the ancient Tower of Babel. The bricks act as universal translators and allow those who hold them to instantly speak and understand any language. They can even be used to speak secret or coded languages (but not if those languages are supernaturally protected, such as with the Enochians).