When Bohemond reached the end of his quest the Lady of the Lake bade him wash the dragon's blood off his shield. The waters of the sacred lake cleansed the shield and imbued it with magical power.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Bohemond's ShieldURL Copied!
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Magic Armour
Shield. Should an enemy strike Bohemond with a magic weapon, roll a D6 for each hit. On a roll of 6, the enemy weapon is snapped in two, parried by the shield, and destroyed. Resolve enemy hits that are not parried by the shield in the normal way but once the weapon is broken all further hits from that weapon are ignored.