Bish, bosh and bash em that usually works
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Now for some real advice, for people who are really stuggling to beat dragon's I recommend traps. Place 6 snare's around the unfortunate beastie and then attack. As soon as it turns hostile the traps will set off and the dragon will drop..............it kind of takes the challenge out of it, so this is a strategy best left to people who have lost days of sleep trying to kill the thing and are on the verge of throwing there PC out of the window.