Kiba wielding Sword Birth (Holy Eraser form)
|Other Names||Demonic Sword Creation|
Sword of Betrayer
|Abilities||Creates Demon Swords|
Creates Holy Demonic Swords (Sword of Betrayer)
Sword Birth is one of the two Sacred Gears that is used by Yuuto Kiba.
In Volume 3, Yuuto manages to gain his Balance Breaker, the Sword of Betrayer, after fusing together the souls of his friends- whom were victims of the Holy Sword Project and his Sacred Gear, Sword Birth.
Sword Birth has the ability to create numerous Demon Swords of different attributes according to the will of the user. The swords, however, are not as powerful as one of the Excalibur fragments. When strengthened by the Boosted Gear Gift, Yuuto can create countless Demon Swords from the ground to attack the enemy.
After gaining the Sword of Betrayer, Sword Birth can be use to create Holy Demonic Swords of different attributes. The Holy Demonic Swords are shown to be roughly as powerful as four of the Excalibur fragments combined.
Holy Eraser, also known as the Light-Devouring Sword, is a Demon Sword that devours holy energy. He first uses it against Freed Sellzen in their initial battle.
Replenish Calm, also known as the Wind-Calming Sword, is a Demon Sword that absorbs wind. Yuuto uses this sword against Karlamine in the Rating Game between Rias and Riser.
Dragon Slayer is a sword specifically made to kill Dragons. The most difficult kind of Demon Sword to produce, Kiba states that he originally started developing it to defeat Issei, should he ever go berserk in Juggernaut Drive again. After the development of Cardinal Crimson Promotion, he stopped working on it, but started to develop them once again in order to defeat Siegfried.
|Sword of Betrayer|
The sub-species Balance Breaker of Sword Birth, the Sword of Betrayer (双覇の聖魔剣（ソード・オブ・ビトレイヤー） Sōdo obu Bitoreiyā), also known as the Holy Demonic Sword of Twin Supremacy, is a fusion between a Demon Sword and a Holy Sword. It debuted during the fight with Freed after Kiba "merged" his Sacred Gear with the spirits of his fallen comrades who were the victims of the Holy Sword Project. The creation of Kiba's Sword of Betrayer became possible after both God and Satan died in the previous war, thus ending the balance between Holy and Demonic powers which allowed the "Holy Demonic Sword" (聖魔剣 Seimaken) to become possible.