Sword blueprints were attainable in the game from 26 April2013 to 6 May2013. Sword blueprints were dropped by a monster or won through the Squeal of Fortune. They were an "uncommon" reward in the Squeal of Fortune. They are needed, but not destroyed, when you create starfire or starfury swords. They can still be used if you got them during the release dates mentioned above.