The Holy Demonic Swords were originally created after Yuuto Kiba fused the Demon Swords of his Sacred Gear, Sword Birth, and the light attribute of his allies in the Holy Sword Project, achieving the Balance Breaker, Sword of Betrayer.
In Volume 11 Kiba faces Siegfried, and reveals that he has trained the ability to form Dragon Slayer holy swords. In Volume 12 he uses this ability with his Holy Demonic sword, but fails initially, due to the extreme hardening of Siegfried's body after using Chaos-Break.
In Volume 12, the Heaven managed to mass-produce prototypes of the Holy Demonic Swords based on the one given to them by Yuuto Kiba at the end of Volume 4. However, the mass-produced ones lack variety and are not as powerful as the ones that are used by Kiba. Due to the characteristic of the Holy Demonic Sword resulting from the absence of God, it can only be used away from the Vatican and Heaven.
Powers and AbilitiesEdit
Holy Demonic Swords have the qualities of both Holy Swords and Demon Swords. This fusion of opposites powers became possible because of the death of the original Four Great Satans, and the God of the Bible who were the rulers of the Holy and Demonic Powers, effectively ending that balance. It also makes them more powerful than a normal Holy Sword or Demon Sword of the same type would be.
The Holy Demonic Swords produced by Sword Birth are at least as powerful as four of the Excalibur fragments combined (Chopper Rapidly) and were able to repel the attacks of the replica Excalibur used by master swordsman Cristaldi. Holy Demonic Swords are also capable of changing into different elemental attributes such as fire, lightning, and ice, or erase light-based weapons. They can also possess dragon-slayer attributes.
- Kiba's fusion of Holy and Demonic with this sword was what inspired Issei to (successfully) attempt to take Vali's Divine Dividing ability by inserting one of Vali's displaced Jewels into his right gauntlet.