Dokuga

Weapon name: Dokuga
Description: A nodachi rested with a black sheath of which had white circles reaching all the way up it to the hilt of the blade where they started to turn black. The hilt has a dark red ribbon tied around its smoot wooden handle. The blade in total was about 4 and half feet long (1.4 meters). It has a long sharp silver blade.

Snake form:

Spoiler:

Weapon special abilities: The Dokuga absorbed the Hebi Hebi no mi: Model Black Mamba.

Hybrid form: The blade is permanently laced in poison. The effect of the poison depends on the choice of the wielder of the blade.

It will take awhile for the wielder of the blade to fully be able to control the snake and the hybrid forms poison. It will take one thread for the user to get some control and three threads for full knowledge and mastery of the sword.

Full form: The blade turns into a black mamba seen above.

I know I am not supposed to comment as I am not an authority and I ask forgiveness on this note, but that is not a black mamba picture you have shown us. That would be the common american black snake, from the looks of it. A black mamba actually has olive or tan colored scales. They are called "black mambas" because their mouths are inky black.

That is actually true, this is a black mamba:



Just change it to be more precise, and we are good to go, since it's not THAT vital. Just for the sake of accuracy.

Google images has failed me again, oh well edited.

*extents arms* Google.
APPROVED.