Blood Shard

Blood Shards are said to have been formed by the blood falling from the quilboar's patron demigod, Agamaggan.

Previously dropped from most of the Bristleback quilboar and from mining/herbing in the Barrens, these shards can now only be looted from Bristleback Thornweavers. These shards no longer have a purpose.

Source
They can frequently be found when mining copper and tin veins in the Barrens. They also drop from the following mobs:



Objective of

 * Blood Shards of Agamaggan
 * Agamaggan's Agility
 * Agamaggan's Strength
 * Razorhide
 * Rising Spirit
 * Spirit of the Wind
 * Wisdom of Agamaggan