The letter wasn't supposed to be found at this time. Moreover, it wasn't supposed to be found out by her.
When Castiel created his Generals, he had also selected one person amongst his Generals for an even more important mission.
He had selected his first General to come to the place where he was going to be sleeping. Castiel had also told him about the location and everything.
His General was supposed to get there, and he was supposed to be the person who took over the body for a brief period. Since it was the first Vampire that Castiel created, he wasn't going to have much burden on his soul, and he could also return to his real body after his work was done.
That's also why Castiel selected a person who was in his early twenties to become his First General with this mission that was supposed to take place after a few decades.
That's also why Castiel was surprised to see Atlas there instead. He was expecting his first General. It was also because he knew that his General's presence in his body wasn't going to alert the enemies about his return either.
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He wanted his General, who was accustomed to his Bloodline and similar strength, to look for the other Progenitors and prepare for the war that was to come.
However, before his General could come, there came a bloodied Atlas, who was at his last breath. Instead of his first vampire, a human came to the special chamber. The loophole that Castiel had left for his General was accidentally utilized by Atlas, right before his death, and Atlas ended up in the body of Castiel.
Castiel knew that Atlas wasn't as prepared as his General was going to be. As he hadn't been a Vampire, his soul was also going to be weaker... Weak enough to be destroyed under the burden of his body. That's why Atlas wasn't the ideal candidate for him.
However, as he heard Atlas' story about how he wanted to save the person he cared for the most, Castiel couldn't refuse Atlas as he had also been in a situation where he lost someone he held dear. He understood the devotion of Atlas and decided to help him.
Castiel not only allowed Atlas to control his body, but he also gave a soul mark to Atlas to protect his soul from the burden of the body for as long as possible.
Even though Castiel knew that he was interfering in his main goals, he still let it be. He didn't use Atlas for his own goals. He didn't even ask Atlas to gather the Progenitors or an army since he wanted him to bring his sister back first.
That's how one accident led Atlas to the place which belonged to the candidate selected by Castiel. And the candidate was on one knee before Atlas.
The person who was in the middle was the one who was selected by Castiel. He was known as Tyler. Even now, he looked the same age as he did centuries ago, being in early twenties; however, his strength was much higher now.
After respectfully greeting Castiel, all the Vampires stood up.
Tyler stepped forward to stop before Castiel. "Welcome back, My Lord."
"It's good to see you back before the time you told me. Does that mean we don't have to execute the plan where I take over your body to gather an army?" Tyler asked directly.
"Take over my..." Atlas was initially confused as to what this guy was speaking, but he soon realized as he remembered Castiel's words.
He understood that the one who was supposed to take over the body, according to Castiel, was Tyler.
"That's right. There is no need to execute that plan anymore," Atlas answered. It was too late for that now, in any case. The others already knew that Castiel was back. There was nothing stealthy about it anymore, so it was useless.
"The enemies are already here, so we are too late for now. Lilith will tell you the rest." He placed all the responsibility to explain on Lilith.
"Ah, you must be Lady Lilith. We heard a lot about you. It's great to finally be able to meet you again." Tyler gracefully bowed. There was a Vampiric grace in every one of his actions which he had no control over. It was natural.
However, Lilith and Luna had been in the presence of Castiel. This much was nothing before them.
"You recognize me?" Lilith asked. Even Castiel created them, she wasn't with him, so it was surprising to see them recognize her.
"Of course we do. Who didn't hear of you? The legendary Witch who made the world tremble with her presence and the person most trusted by our Lord. It's great to see you back as well."
"I'm afraid I don't recognize the others here. But if I were to take a guess, he must be Lord Vor?" Tyler asked, glancing at Vor.
"How did you recognize me?" Vor asked. Even he didn't remember seeing this guy before.
"Your strength and your aura... It's quite powerful as that of a Werewolf King. Moreover, your features are what we heard for Lord Vor, who was another trusted friend of our Lord. That's why I took a guess. It seems I was right."
"How can you know that I would still be alive?" Vor asked. Even though he looked like Vor, a long time had passed since that. So for one to guess who he was, and at the first try, that was certainly incredible.
"That's why this world is fascinating, Lord Vor. You three existed at the same time together, so it would make sense that you three returned at the same time."
"If I'm not wrong, the one before you must be a descendant of you? He seems to share your features but is somewhat weaker than you..." Tyler further guessed.
"What about me? Can you guess who I am?" Luna asked. Tyler guessed everyone correctly since they were related to Castiel. She was also related. Was she also as popular here?
Tyler observed Luna before shaking his head. "I'm afraid I can't recognize you. I have no guesses, but since you're together with the others, you must be friends as well."