Then, the Contender in Kiritsugu’s right hand gave a roar. This is the single-shot bullet that made Kayneth bear his despicable scar the first time it penetrated Volumen Hydrargyrum’s defenses, something with far more destructive power than the 9mm bullets.

However, the degree of defence the mercury mountain of swords put up wasn’t even comparable to that of the membrane.

All the spikes closed up together like a Venus flytrap the instant before the killing move touched the mercury spikes, and surrounded the bullet. The thick cluster thin spikes became a single giant column in the blink of an eye, completely sealing off the .30-06 Springfield bullet.

Volumen Hydrargyrum, made to interchange forms freely, showed what marvels it can do. The immaculate skill that controlled the magecraft of fluidics to such perfection should indeed be the epitome of this unparalleled craft, fully worthy of the prestigious name of the Archibald house.

The moment he beautifully completed this magecraft he devoted all his skills in – Lord El-Melloi’s destiny also came to its end.

---

When the Emiya family of the previous generation determined the "Origin" of their son and heir, at a loss they named him "Kiritsugu" due to the strange results.

Basically, he possesses the dual attributes of "Fire" and "Earth". To be specific, they were composite attributes, "Severing" and "Binding". That is the form of his soul that was born with him, and the true form of his "Origin".

Sever, and bind – it’s not exactly the same as being called "destruction and rebirth", because Kiritsugu’s Origin has no meaning of "recovery". For example, a string that is cut and then connected again would have change of thickness at the point where the knot is tied. That is, the action of 'severing and binding' would cause irreversible "corruption" in the target.

Kiritsugu became particularly aware of his Origin when he was asked to complete some hands-on work. His hands weren’t very skilled. If a normal contraption breaks down, he could fix it. But if it comes to delicate machinery then everything would suddenly become the opposite. The more he wanted to fix it, the worse the damage would become for the machine.

As a matter of fact, Kiritsugu’s handcraft isn’t extraordinary. If a normal metal wire snapped, the original function can be restored by just connecting it back together. However, if he were to fix a delicate electric circuit using the same principles, the result would be fatal. It wasn’t something that would work as long as everything is connected. If the connections become out of order, the circuit would lose its function.

This wasn't something created by Kiritsugu’s personality or temperament; from magecraft’s point of view, it is the true essence of the root deep within his soul.

Emiya Kiritsugu utilized his extraordinary "Origin" to its fullest extent when he created his Mystic Code. The first and second ribs on both sides were cut off and taken out of his body. The extracted ribs were grinded into dust, condensed with a craft to preserve the soul, and sealed within sixty-six bullets as their core.

These bullets would actualize Kiritsugu’s "Origin" on the target when it hits. If it were to hit a living creature then there would be no wounds or bleeding, but the place where it was hit would appear to be suffering necrosis. The surface may seem to have healed, but the nerves and capillaries wouldn’t be regenerated properly and the original function would be lost.

Moreover, as a Conceptual Weapon, this bullet poses an even graver threat to magi in particular.

Kiritsugu had already used thirty-seven bullets, but not a single one of them was wasted. The bullets that were made using a part of his body had already completely destroyed thirty-seven magi.

Now, the thirty-eighth "Origin Bullet" severed a new sacrifice’s life force.

Kayneth probably didn’t comprehend what was happening to his body until the end. The moment that the excruciating pain spread into his body, all of his vital organs and nerves had already been torn into a shapeless mess.

Before a scream escaped his throat he was already spurting out blood. All the muscles in his body were sent into spasms with uncoordinated movements conducted by a nervous system that was on the edge of being broken; the lean body clad in the chic suit began to perform a ridiculous dance.

Using intense pressure to make the densely-packed prana, circulating in the Magic Circuits, suddenly begin to ignore those paths and flow chaotically, destroying the practitioner’s body in the process. The moment Volumen Hydrargyrum blocked the Contender’s strike, Kayneth suffered damages more severe than getting directly hit by a bullet.

When Kiritsugu’s magecraft bullet is interfered by magecraft, the impact of the "Origin" within the bullet would affect all the way down to the Magic Circuits of the practitioner.

If we were to compare a magus’s Magic Circuits as a high-voltage power cable, Kiritsugu’s bullet would be a drop of water. What would happen if a conductive liquid attached to a thickly-placed electrical circuit? The short-circuiting current would destroy the circuit itself, resulting in permanent damage.

Just like that, shorting out Magic Circuits is the terrifying effect of Kiritsugu’s Mystic Code.

In order to avoid the damage of Kiritsugu’s magecraft bullets, one has to discard all magecraft and purely defend the bullet by physical means. On that point, Kiritsugu’s choice of using .30-06 Springfield bullets is a malicious one. There isn’t something that can completely block this specialized hunting rifle round to begin with. This is a type of bullet that excelled in penetration. As long as one isn’t in an armored vehicle, one can’t avoid getting hurt.

- Fate/Zero: Act 7, Part 3