He was the one responsible for forging the Promise. In a conversation after suffering from the loss of a battle. He comes up with a plan to offer humans for negotiation but feels ashamed for thinking that up in the first place. While Julius and his army were resting from battle. Leuvis attacks the camps, leaving only Julius alive. While realizing this was a chance to stop this war, he surrenders himself to be taken to the Queen for negotiations. He was the one responsible for forging the Promise.
After arranging things out with Leuvis, he confront his allies. He talked about reconsidering the plan which his allies disagree with. After realizing they can't be convinced anymore, he betrayed his allies in which they are sacrificed as the first Cattle. It was found out he already made the deal with the King without their consent.
While making the deal with the king. Julius asks for the world to be split in two, In which the King accepts. However the King reveals for the deal to work, he must also receive a "reward" The King has to be given the best high quality meat and Julius has to keep the responsibility of being the Gatekeeper. Julius and his descendants, the Ratri Clan are responsible for keeping the balance between both world. After hearing this, Julius reacts regretfully for the responsibilities he must bear for the rest of his life.
Being born a Ratri, Julius thus has the family's distinctive green eyes and white hair, which he kept long and slicked back. Julius has a tall and long nose line as well as pupils with concentric circles. In battle, Julius wears a light-colored hood donned with an armor helmet and gloves, what lied under his hood is black wool-like clothing covering up his limbs and his neck.
Julius appeared to have a good responsibility on his shoulders and a leader-type of personality who cared about his comrades deeply. While he sometimes let his pessimistic thoughts take the better of him, he always managed to snap out of it. He was sick and tired of his family, friends, and comrades being killed and eaten by the demons. However, his means to achieve peace between the demons had him betray his allies and had them eaten by demons when they refused to allow a certain portion of humans remain as an offering to the demons, so he and his people could live in peace safely away from the demons. In return, Him made it so that Julius and all his descendants would uphold the human side of the bargain and collaborate with the demons forever, meaning he would never be rid of his guilt and always be near the very demons he wanted to flee from.