Eragon finds a smooth stone and when he tries to buy meat with it the store keeper says, "Why are you trying to buy meat with a stone?" Eragon says, "Well, who would carve this stone if it didn't have value?" Eragon is fighting a shade. A shade is someone who can only be killed stabbing him in the heart. Eragon stabs him in the heart and all there is inside the shade is darkness. If you like action then I recommed you Eragon.