Horo wasn't aware of the full extent of the might held by silence. Due to his training when growing up he learned to intuitively sense the danger coming from everyone in silence, but he noticed as he grew stronger and older that there were less and less members of silence to make him feel that danger, and by the time he became 18 he couldn't really feel danger anymore from anywhere in silence not even the headmaster. He also knew that the true masters in silence wouldn't release the sense of danger regardless, so he couldn't properly plan his escape no matter what due to not truly knowing the threats there. None of that mattered to him thought he planned as much as he could with everything he knew, he continued to hone himself and progress his powers for three years.
During the three years he begin forging a weapon, a weapon he poured his all into, everything his knew including inscriptions, naming , alchemy, his abilities, relics and special materials. It was his favorite weapon he always like to used, it was a long knife with a special special shape connected by chain to a beautiful super curved dagger. The forging process was complete after a year and a half. The finished weapon was something that stands at the highest tier of artifacts known to him, and what he knew of the world, new and old, was beyond imagination.
The weapon was named Soururipa which meant Soul reaper, then granted life, and directly connected to his being by his link ability. Those were the last three things he did to the weapon and something strange happened, the weapon was wrapped into an extremely dense black light shaped like an egg with golden cracks and ethereal looking moving inscriptions shaped like chains wrapping around it, after that it sped into the tree on his back and made it impossible for him to view it.
He hoped Soururipa would leave dormancy when needed. Little did he know he wouldn't see this weapon no time soon, not even in this life.
He continued refining his techniques and abilities until one day a perfect opportunity appeared. The head mastered was to leave silence for a period of time to complete a task, and he was the reason Horo continued to hesitate and prolong his plans while honing himself. The night he planned to leave, he was unaware that the headmaster had long since knew of his intentions and made the elders aware of his plans to be on guard. However the elders were unaware that they would be facing a true demon in the body of a 20 year old, and he would make blood rain down the mountain that night.