actually, level 7, not 13. but that method uses shenanigans.
also, that is what patrons and non-magic/gp loot is for. after all, it may only be a piece of paper, but a title says you own it... you might have to clean out a few monsters or outlaws or something... hey, wait a minute. that is starting to sound like a ready made hook for dm plot line.... maybe you should just talk to your dm. it's not often that pcs want to be a sitting target, after all. maybe he or she will appreciate the novelty enough to grant the player's wishes.