Ruin & Despair

Ruin & Despair (廃墟と絶望, Haikyo to zetsubō) are two swords created by Sano Mikoto after using the Soul Forge. A few sensor ninja has stated that the each sword has its own chakra signature different from Sano. Sano stated that this is one half of his soul, that they are his soul after her was greatly injured by a ninja.

Ruin
Is one of the two "living" swords created after using the Soul Forge. It takes the form of a large sword extending 4 feet. It has a single crystal orb floting at end of the handle and the begining of the sword. After Sano took Imi's Ten Byakugan and sealed it within the crystal. It is able to use the Kamimusubi a powerful jutsu that belonged to Imi.

Despair
Is one of the two "living" swords created after using the Soul Forge. It takes the form of a large sword extending 4 feet. It has a single eye connecting the end of the handle with the begining of the sword. The eye seems to move and follows movement of an enemy or Sano. After Sano took Yomi's Mangekyō Sharingan and sealed it within the eye. It is able to use the Ame-no-kagaseo a powerful jutsu that belonged to yomi.

Oblivion
Oblivion is the combined and true form of Sano's swords it takes the form of a large claymore with a horned skull connecting the handle and blade. The eyes of the skull posses yomi's Mangekyō Sharingan and Imi's Ten Byakugan. The blade has a long spine running done the middle extending from the skull. Sano stated that this is the true form of his swords and soul. It posses greater power then the two.

Trivia

 * Ruin and Despair are based off the Soul edge and Soul Calibur.