Marvel Earth-616

Theo, Summer, and Agares enter a new world together.

Theo enters a dangerous world this time: Marvel Earth-616. As soon as Theo arrives, someone appears in front of him. It's Stan Lee.

Theo: "What? This is ridiculous! Stan Lee, what are you doing here?"

Stan Lee: "Hahaha, I'm known here not as Stan Lee but as TOAA (The One Above All).

Theo: "Are you serious? A genius like you! I'm in shock."

Stan Lee: "I know, I know. I'm amazing, aren't I? So, what brings you here?"

Theo: "Yes, sir. The reason I'm here is that I've always admired you in this world, and now that I have the opportunity to come here, I seek your permission to enter."

Stan Lee: "Which reality do you wish to enter?"

Theo: "Earth-616."

Stan Lee: "Honestly, it's difficult for me to grant that request. That's the main world, the Prime Universe—it's the last of the old and the first of the new. Everything revolves around it. Here, science can be magic. Here, you can rewrite every story. That's why it's a tough place: fate, tragedy, maniacs wanting to destroy the world, multiversal threats. There are even a few individuals there who could threaten me. Are you sure you want to go?"

Theo: "Yes, sir. If you allow me, I would like to enter."

Stan Lee: "Very well then. Swear that you will not go to any other multiverse from that universe."

Theo: "I, Antares, swear that I will not visit any other multiverse within the Marvel worlds and will only stay in the Prime Universe."

Stan Lee: "Good, good. You may go now. I'll inform the Living Tribunal about you, and will you cause chaos?"

Theo: "Actually, my goal is chaos, but at least I won't destroy the Prime Universe. I will probably just challenge everyone."

Stan Lee: "Looks like Death will have a lot of work because of you. She'll have to work hard while you're around."

Theo, scratching his head with concern: "For now, thank you for everything, and I apologize in advance for the chaos I'll cause."

Stan Lee: "I like you, kid. Now go, your friends are waiting for you."

Theo reappears in front of Summer and Agares.

Summer: "Master, where were you? We were worried."

Agares: "As much as I hate to agree with this woman, this time I do."

Theo: "It's not important for now. I spoke with someone. Now I'll discuss important details with you. My goal is to bring chaos to all 10 realms and destroy Yggdrasil. This path will be difficult, so I will train you."

Summer: "Master, I don't understand what you mean."

Theo: "What I mean is that we will declare war on the entire universe. There are insanely powerful beings on this path, and I will train you."

Agares: "Is this the dangerous world you mentioned? It sounds terrifying. I look forward to becoming stronger."

Theo: "You will become at least 1000 times stronger than you are now."

Both Summer and Agares are excited.

Then, Theo appears on a spot in space.

He senses eyes on him, probably curious about who the invited guest is. Theo casts a spell to nullify all gazes.

They reappear elsewhere, where no one is watching, and Theo looks around.

Theo: "This place is good. There are no planets around."

Then, Theo creates a planet, half the size of the Sun, and fills it with life, turning it into a paradise. It's essentially a large piece of land with no continents.

Theo also creates a day-night cycle.

Then, he prepares a fortress for their stay and accelerates time there.

Theo: "You will train here for 100 years, while I will study the neglected techniques of ki. I'm giving each of you a clone that will train you, and don't worry, 100 years here equals 10 days outside."

Summer: "That's expected from my master."

Agares: "Every time I see your power, I'm terrified."

Theo: "You two stop the flattery."

After a long time, Theo starts training himself, creating many clones to study techniques and fix his dantian. Theo hadn't trained his ki since childhood.

The last time he did was when he was young, and many years had passed. He hadn't trained because his ki was adapting to the amount of magic, accumulating in his dantian.

When he became the Demon God, his ki turned into divine ki. All he needed to do was purify it. After that, even the strongest immortals couldn't match him.

The clones Theo created were teaching Agares and Summer how to better use their magic and the intricacies of martial arts. They corrected their bad habits, showing Summer how to better use dragon magic and Agares the nature of demonic magic and its applications.

So, 100 years passed on this planet with continuous training. This pushed Summer and Agares to their limits. Sometimes, they even called their master a training monster. Their power had qualitatively reached a new level.

Now, it was time to go outside.

(The reason for declaring war on Yggdrasil is similar to what the Scarlet King did: a war against all creation. In this context, Theo wants to reach the highest possible power level.)

(Theo has now officially entered the Marvel universe. I was originally planning to send him to "Cultivator Against Hero Society" because it's fun, but since he has already been inside of two manhwa worlds, I didn't want to send him to CAHS just for now. For those who wanted Tensura, there's nothing to do there, and the same goes for Naruto. Please understand.)