The concealed blade can be installed into any limb replacement and used as a melee weapon that extends from the limb when the user needs it to. The blade is only visually hidden inside a military or bionic limb. The blade is controlled by a specific muscle contraction that the user learns shortly after having the blade installed. The blade is a melee weapon that inflict 3 Slash and 1 Shock on hit.
The use of concealed blades are prohibited by law, and anyone installing one must hold a license and register the implant.