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Iron Muscle is the Nadashinkage’s variation of the old Chinese martial Arts technique “ Iron Spirit”. Referred to as the art of a polished steel body it is an exercise in which the practitioner conditions their body to become durable enough to resist an enemy's attack without succumbing to serious injury, if any at all. When fully mastered user becomes like a piece of metal itself. Resilient and impenetrable, Iron Muscle is so great that it is almost impossible for even a spear to pierce it.

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