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Bladeshock Mechanism (4e Feat)
From D&D Wiki
Bladeshock Mechanism [Racial]
Two small blades of a custom shape fly through the air from your chest, spinning through the air and implanting themselves deep in your foes.
Prerequisite: Metalborn, armor lockup racial power
Benefit: If the creature that triggered your armor lockup did so with a ranged attack, it takes damage equal to 2 + your Strength modifier.