Tattoo of the Liquid Skin

Once per long rest, as a bonus action, you may activate the tattoo and transform into any medium-sized humanoid that you are familiar with. Your physical appearance matches perfectly and is indistinguishable from the original individual, and lasts until either the next long rest, or you intentionally dispel it. If you suffer any damage while using this ability, you must roll a d20. On an 18 or higher, the shapeshift is maintained. On a 17 or lower, you revert to your original form.