Adamantine Tattoo Ink of Unarmored Defense

This vial contains a substance that looks like a black liquid with flakes and specks of adamantine powder floating around in it. Having it embedded into your skin by means of tattooing provides a +3 bonus to AC and causes critical hits to be turned into normal hits. The tattoo must be large enough to cover the entire torso(front and back), arms, and legs. This magical ink does not count as wearing armor for the purposes of armor calculation. Placing it over tattoos that already exist will cause it to mimic their color scheme, however, over bare skin it just appears black with a blue-ish sheen.

While wearing armor, the magic of the tattoo is suppressed.

The application of this ink as a tattoo is very painful and rigorous, and during the process of it you take 20d6 damage from flakes of adamantine being embedded into your skin. This damage ignores resistances and immunity.