Keyblade (3.5e Equipment)
From D&D Wiki
The Keyblade is Martial weapon first invented by adventurer Tylo Malchard, and crafted by Smith Liliana Summerfeld. It is shaped like a key. The blade is sharp on one side, and on the tip of the opposite side it has three-four spikes that can be used to inflict 1d4 piercing damage. The hilt is fully enclosed by a circular hand guard. In order to be effective, it must be crafted out of adamantine, which makes it much more expensive than other weapons. Since its introduction it has been used in few instances, given it's awkward shape, many would just assume carry a normal long sword. Because of this, it has become a solely commissioned weapon, only crafted after an individual has requested it.