The sword is huge, and decorative, made of Black Steel with etchings of Dwarfs and Dragons fighting down the length of the blade. Its CraftsDwarfmanship is of the highest quality.
The king walks up to the blade, and makes a gesture, a large pedestal is wheeled out into the middle of the room, on it is a huge Dragon scale. Not the tiny Black Dragon broodlings, this likely came from the queen herself. It would be akin to hitting a target made of plate steel.
The king pulls back the weapon and bring it down, it down, a rune shines on the hilt as he strikes, you know it as a Strength rune, The weapon sinks into the scale and the crowd cheers apparently sinking in even a fourth of the way is an amazing feat.