In Blasted Lands there is a dragon called Teremus the Devourer, simply just pull him to Nethergarde Keep, into the castle on the left, make a right once inside and when he comes up to you he should get stuck. Once stuck you can continuesly beat on him till hes dead while he cant attack you. You might want to let him finish off any guards that agro for they can get agro off you and you can lose the kill. Easy way to make tons of gold, just try not to get caught by people who are likely to report you.