[As he's holding it, he'll be able to tell that it's pretty expertly sealed-- if it were unsealed, the arm itself would be larger than Chise entirely, and while it's oversized like this even now, it's sealed and bandaged, but looks like it might burst at any moment.]
Back home... there was a young dragon that needed to be saved. We went to rescue it but-- all she wanted to do was go home and she was full of bitterness, hatred, and madness. Each dragon has pure power within it and champions of old used to drink their blood to get that power-- for me, I drew the fear, pain, and anger into myself and it became like this.