Name of Weapon:Dark Samehada
Wielder of the Weapon:Yami
Creator:Yami
History:After observing the samehada of Kisame with his sharingan eye he replicated it and made it more loyal. He trained with this blade so that he doesn't feel fatigued after making use of it and he plans to pass it on to his successor. Since he made the sword there isn't much of a history. . .yet.
Other Forms of Weapon:It grows as it absorbs Chakra.