He decided to ignore the prince's mysterious origin. Who cared if he would end up against the world? As long as his ultimate goal was accomplished, he was willing to sacrifice everything.

"How can I be sure that your Highness will stick to your promise?" The Water Demon continued.

"You don't trust this prince's words?" The Demon Prince picked up another grape.

"Of course not, your Highness. It's just that this subject would be even more motivated to complete tasks for your Highness, if your Highness swear in the name of the Universe to keep the promise."

A humorless smile bloomed on the prince's face as he took in Leviathan's indirect threat. He truly disliked to be threatened, but made an exception this time.

"Sure. In the name of the Universe, the creator of the Four Realms, I, Beelzebub of the Royal Demon Clan, swear to uphold my promise to help the Great Water Demon Leviathan in his search for revenge as long as he has a loyal heart and never chooses to betray me."

As an answer to this pledge, the cave was momentarily filled with overwhelming energy before dispersing. If the prince would break his promise, he would receive retribution from the Universe itself.

When Beelzebub was done, Leviathan deemed it alright to consume the Gu poison. He thus let the pill with the poison fall into his palm before forcing it into his mouth. Immediately, he could sense something foreign spread inside his body and then stop somewhere in his abdomen.

"Great. From this day and forward you can forget your birth name. Instead you will be called Sixty-three." The prince's mood was finally improved.

"Yes, your Highness."

"Remember, never betray me. Don't even think of betraying me or you will get a taste of a pain worse than death."

"Of course, your Highness." Sixty-three bowed once again before daring to inquire.

"What about the ident.i.ty of the culprit, your Highness?"

"The time has yet to come for you to know. But as long as you work hard, the day will arrive." Beelzebub turned around, which was copied by Zero.

"But your Highness-"

"Follow up." The prince interrupted and started to leave. Sixty-three immediately chased after and left the cave.