Source: Tasha's Cauldron of Everything

Wondrous item (tattoo), very rare (requires attunement)

Produced by a special needle, this magic tattoo features designs that emphasize one color.

Tattoo Attunement. To attune to this item, you hold the needle to your skin where you want the tattoo to appear, pressing the needle there throughout the attunement process. When the attunement is complete, the needle turns into the ink that becomes the tattoo, which appears on the skin.

If your attunement to the tattoo ends, the tattoo vanishes, and the needle reappears in your space.

Damage Resistance. While the tattoo is on your skin, you have resistance to a type of damage associated with that color, as shown on the table below. The DM chooses the color or determines it randomly.

Absorbing Tattoo
d10 Damage Type Color
1 Acid Green
2 Cold Blue
3 Fire Red
4 Force White
5 Lightning Yellow
6 Necrotic Black
7 Poison Violet
8 Psychic Silver
9 Radiant Gold
10 Thunder Orange

Damage Absorption. When you take damage of the chosen type, you can use your reaction to gain immunity against that instance of the damage, and you regain a number of hit points equal to half the damage you would have taken. Once this reaction is used, it can't be used again until the next dawn.