Weak Blood Shard

The Weak Blood Shard is a component used in upgrading the Blood Altar to tier 4, as well as in the creation of Bound Armor through the Soul Armour Forge. The Weak Blood Shard is used as a crafting component in the Empty Socket, Arcane Pedestal, Armour Inhibitor, Energy Bazooka, Key of Binding, Large Bloodstone Brick, and Reinforced Teleposition Focus.

Recipe
In order to obtain a Weak Blood Shard, a mob must be killed while under the effect of the Weakness debuff, which can be created by the Bound Blade. Weak Blood Shards can also be duplicated when combined with a Master Blood Orb, Imbued Slate and another Weak Blood Shard.

FTB Infinity Evolved
Weak Blood Shards are created by placing a single Mana Diamond into a Blood Altar with 2000 LP.