Originally Posted by
AslanCross
Dragons should always fight on their own terms. They have two primary advantages that the PCs are likely going to have to prepare for if they expect the battle:
1. Flight. Never put the dragon in an environment where its flight is negated. As such, while the cliche of the dragon in the cave comes from the lovable tradition of The Hobbit, where was Smaug's battle fought? In the sky, with a lot of flying room. Bilbo didn't fight Smaug in his own lair. (So yeah, I really hate the "fight the sleeping dragon in its lair" cliche.)