The collar, yes. A grim reminder to any fae that they could end up in the same situation if any witch happened to look at them the wrong way. No fae likes being trapped, especially not an Unseelie. And Mogget has been trapped for over two thousand years, so yeah, he's a little grumpy.

"You don't say," he drawls. "I'm afraid you couldn't help me out of this even if you tried. Shoo."