The curved one is a ritual knife, made from dragon horn. Rare, and valuable. If the dragon whom the horn was taken from is still alive, the knife posesses great power, but the owner is in danger of being hunted down by an irritated dragon missing a horn. The other is a disembowelling knife, set with dragon-stones. The harvesting of dragon jewels is now illegal and these knives are either antiques or black market replicas. Made on the forest/mountain borders (where the best stones and metal are found), because the stones must be set quickly to retain the power.