The ambush stones from Pinkerton’s Pile aren’t actual physical items. It is instead when Crim appears suddenly under an item your dragon just moved and asks, “What’re you doing?” in a rather sinister manner. Your dragon then figuratively (maybe even literally, depending on flight) shits bricks and flies/runs off, but with imparted knowledge of, “So that’s how ambushing works.” They are then free to teach a dragon this technique. 

Reblog if you believe in a thing that most people on this site believe

I’m going to write down everyone’s name, get a tattoo of them, and show my extremely bigoted relatives, who for some reason will be convinced by the notes of a post on the Internet