Moral Compass Tattoo

Description
This tattoo takes the form of an ornate, compass with demonic and angelic figures entwined around its structure. Notably, it lacks any indicators of North, East, South or West. It allows the wearer to detect a targets moral alignment (Good/Neutral/Evil).

Charges
The tattoo has 3 charges, which regenerate daily at dawn. Each use expends one charge.

Detect Alignment
As an action while the tattoo is on your skin, you can make a (Wisdom) insight check opposed with the targets Charisma saving throw.

Success allows you to sense that target's moral alignment; so either good, neutral or evil.

It is not apparent that you're using this ability to sense anything, though some creatures may be able to notice, it is apparent that you're making physical contact with the target.

Other Effects
In the case of The Amazing Claire, this tattoo has removed from her mind any and all memory of her cannibalism.

Source
This tattoo was created by Fell, from Fell's Tattoo Parlour.