Integrates cnidocyte cells from box jellyfish into the skin of the forearms, hands, and upper back, creating a contact-activated sting defense. When the skin is touched with sufficient pressure (a grab, a punch, a grapple), the cnidocytes fire microscopic barbed threads that deliver a potent neurotoxic sting. The pain is immediate, intense, and debilitating — comparable to a full-body jellyfish sting concentrated in the point of contact. The effect is purely defensive — it only activates on contact pressure, not casual touch. The user's own skin is immune. Crucible Genomics' installation includes a voluntary suppression system controlled through skin tension, allowing the user to shake hands without incident. Black-market versions often lack this refinement, making any firm contact dangerous.