Leyline Tattoos

*Homebrew - I'll do a quick poll before starting the campaign to see if anyone would like this addition.   After a player character comes into close proximity with their second Leyline, they may go to a local tattooist to get a magical tattoo (Uncommon, Requires attunement) for a fee. The magical tattoo provides some magical ability that starts very modest. But with each visit to a subsequent new Leyline, the player may expand and upgrade their existing tattoo.   Characters can attune and un-attune to their tattoo during a short/long rest. The tattoo stays on the character's body permanently.