He did it. He said he would do it, so he did it. He would have been a liar otherwise, right? Can’t have that.
Anyway, the tattoo is on his forearm, and he’s always got a jacket on, so no one’s ever going to see it. That’s not really the point. It’s Hades’ symbol. It doesn’t make up for the loss of the ring, and he’s going to keep pestering the robots until he gets that back. It's simple and black and not very big. He's still admiring the work as he wanders away from the parlor.]