While he was running among the trees full speed, Yato began to think of why something like this happened to them.
After some more running and jumping, at the same time as he had arrived to his Clan Settlement´s center Yato froze completely in his place. He didn't scream nor cried, after seeing all of the remaining Kokketsu-users on the ground, lifeless.
He was so shell-shocked that he didn't sense a deadly blow coming from behind. Even after turning to face his attacker and even trying to block it in last second, Yato was still punched trough his chest, right on his heart from the front, by a blood coated magma fist. Afterwards of coughing a lot of blood, Yato began to fall backwards. While his body was falling to the ground, the full moon that was shining in the sky began to get smaller until Yato´s cold body has fallen to the ground and shattered in pieces.
Being the sister of the original and strongest Moon God, Tsukuyomi sensed right away the disappearance of the Spiritual Moon in her eldest brother's world. With a dreading heart, Tsukuyomi glanced to where her brother was. As she did, Tsukuyomi began to rush straightaway towards her father to tell him that her brother was in the brink of death. As the door of his room was opened with a lot force, Izanagi turned to face his youngest daughter with concern. But as he saw Tsukuyomi's face, his concern changed to full out anxiety. Without even being able to ask about what is wrong, Tsukuyomi exclaimed to his father that Yorugami is in danger of dying. At first he couldn't comprehend of what is really amiss, but as heard the Moon in his son's world disappeared, Izanagi immediately descended to Yorugami's World to save him before he was to late.
At the same time as he had arrived, Izanagi rushed towards Yato's side and crouched down closer as much as he could. As he was staring with worry at Yato's motionless body, Izanagi saw his son's half-closed white blank eyes. While he was trying to figure out of how could this happen, Izanagi was inspecting Yato´s still bleeding lethal wound. To his growing fear, after examining closer, Izanagi found out that a very powerful curse was placed on Yato, which had neutralized Yato's regeneration ability.
Before Izanagi could do anything to stop the bleeding first, the sealed half-soul of Yasuna, in exchange of his own life, transferred his own life-force to Yato and restored his half-gone life. Even then, because of the curse, the gaping hole in Yato's chest didn't disappear.
Afterwards of realizing it, Izanagi lay his glowing right hand above the gaping hole and as a means to nullify the curse, Izanagi literally opened inside the space on Yato's chest a small black hole that began to absorb both the natural energy that was around them and all of the Kokketsu that was splattered on the ground from every laying corpses. As he knew that this curse`s effect could only be nullified after being overthrown by an outside force.
The more the black hole was absorbing the necessary sources of bringing Yato back to the living fully, the more the gaping hole began to close while melting together. While the hole was fusing as one and leaving an awfully deep X shaped scar behind on both sides, Yato began to rise on his feet with his whole eyes shining white, even he was barely awake.
However, even after his lethal wound was sealed shut, the absorption didn't stop and began to get out of control. When it was just absorbing in slight extent the pure nature energy and the Kokketsu all around him, it began to absorb them in a very extreme amount in the shape of enormous glowing white tornado. The more power was being absorbed inside, the more began to shine Yato's body, until the gigantic tornado´s color began to change into white streaked black as the natural energy´s light quality had been absorbed to much.
While the white streaked black energy was spreading and covering around his whole body, Yato began to transform. With his dormant dragon blood being awakened, from his forehead began to grow long and thin horns and after they had grown out completely, his horns began to merge together with the horn-like fox ears on top of his head. As his fox ears and dragon horns merged together into a long rabbit-like ears, the claws on both his hands and feet was getting longer & sharper together with his fangs that became shark-like razor sharp in three rows.
However Yato's most noticeable transformation was the ten tails that was growing from his tailbone together with many of his bones jutting out from his completely black-chakra covered body. The more his ten tails was getting out, the more Yato's body began to grow into colossal size until with a blast of black chakra and a ear shattering thunderous roar, Yato completely transformed into his own Tailed Beast Mode.
Although his Bijū Form was(is) a colossal Kitsune with solid black fur and red markings around his eyes that goes up to his long ears, he was with one word intimidating to anyone who saw his humanoid but monstrous form. But the one thing that made many people stop in terror was his entirely black eyes.
As he regained his consciousness slightly, because of his growing sadness, anger, rage and hate, Yato began to lose control of himself. Without giving a chance for the many gathered crowd to run, Yato began to decimate everything in his sight. Since he had completely gone berserk, Yato began to unleash shockwaves all around either by roaring or jumping from a village to another, crushing any mountains and beings with his tails or hands that was in his red seeing view. But the worst thing he was doing, was firing many Bijūdama´s all around, like a rampaging Bahamut.
As if it was an ending or an judgment, after halting his rampage just slightly, still being in place and in berserk state, Yato began to supercharge his Bijudama and created it one several times bigger than his own size. (Yato is 3 times bigger than the Jûbi in Cannon.) After charging it completely, Yato fired the menacingly glowing red-outlined black Jūbidama to the center of Ōyama no Kuni.
Ōyama no Kuni, that was five times bigger than Hi no Kuni and well known for its own size and sky high mountains, after the blast that consumed the whole country had been turned into straight, barren wasteland with every living beings killed in just one night.