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sunmaylight · 19 days ago

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Shazam/Captain Marvel (DCU) x FGO Idea

Something I’ve been on and off writing plot points of is a DC Comic x FGO crossover idea where Billy Batson (Captain Marvel/Shazam) is the Master of Chaldea.

Now my knowledge of Billy Batson isn’t that great but I’ve done some research on this character to think he would be a good idea. Plus his connection to the Rock of Eternity and Shazam/Captain Marvel transformation opens up a nice can of worms. Even if my knowledge of Fate Series is mostly FGO and watching some of the Fate shows.

Anyways, Chaldea Master Billy Batson but he doesn’t transform into Shazam during the Singularities except for the Final Singularity. Also Constantine is there cause I like the fanfic author’s dynamics between him and Billy.

Some info of this crossover idea below

Premise is that Billy has been a Justice League member of the Justice League since he was 10 and been Shazam since he was 9 years old. His age and identity has been revealed when he is 12 because of a mission going wrong.

Here is a very small blurb of the Prologue (Singularity F) Section I wrote when I was writing this idea. It explains a the reason Billy is at Chaldea

Billy was 12 years old when he was chosen as the last Master of Humanity. 12 when he started a long battle to save humanity, 13 when he was bestowed the ranking of Cause, 14 when the last Epic of Remnant was taken care of. The battles he faces as Captain Marvel and Billy are nothing compared to what he experienced during the time spent with Chaldea.

Three years of war, hardship, struggle, death, life, joy, experience, companionship, and love.

This is his story of his time with Chaldea.

——

It’s been about a month since Billy revealed his true identity to the Justice League, two years since he was recruited into the Justice League, and three years since he was given the powers of Shazam. Yet, ever since they found out about his true age, Billy has been treated as- as a kid! Instead of a respected Superhero and “co-worker”, as the others put it, before his reveal.

At first he didn’t mind, but the longer it went on, the more he became sick of it. He needed a break.

His answer came as a call from John Constantine about requesting assistance for a job outside Fawcett City. Not as Captain Marvel, but as Billy Batson. Billy was curious about the distinction between the two identities, but agreed to it in the end. Fawcett City and the Justice League would be fine without him for a couple of days. Right?

If Billy could jump back to this exact point in time, he would have told his past self that it is actually longer than a couple of days.

In this AU, Zatanna is the on originally tasked by the Justice League Dark to observe Chaldea’s First Rayshift and give back a report. However, something comes up for her as the days dwindle down to the First Rayshift. She contacts John Constantine to go to Chaldea in place of her and he accepts.

Constantine remembers how Billy isn’t doing so well after the identity reveal and decides to bring him along. He contacts the boy under the guise of needing assistance that Captain Marvel can only help with. Billy agrees and the respective parties of Justice League Dark and Chaldea are contacted about this change. Which is also verified by Zatanna to avoid any breaches of security.

As John Constantine and Billy Batson prepare for the trip to Chaldea. Constantine stresses to Billy that he is at Chaldea as his ward and not Captain Marvel. The adult also tells Billy that he shouldn’t transform into Captain Marvel unless strictly necessary.

“Think of this as a learning experience for when you need to go to some magic place as Billy instead of Cap. You need to build some rep, kid. Here is a great place to do so”

Which Billy begrudgingly accepts the reasoning.

Which then leads to Billy and Constantine in Chaldea. Where Billy is immediately separated from Constantine somehow and is whisked away by Chaldea Staff to the Simulation Room. John Constantine lowkey panics over his ward’s disappearance while Billy goes through the FGO demo fight after realizing that he can’t get out any other way without exposing his Superhero alias.

Billy exist the Simulation Room and has the canon prologue interaction with Mash, Fou and Lev. Except that Lev gives Billy a piggyback ride to the entrance Rayshift Room. Lev’a reasoning is that it is faster than waiting for Billy’s short legs to keep up. It has nothing to do with the faintly familiar feeling of Solomon that the demon inside of him feels towards the young boy

Upon entering the Rayshift Room, Billy and Constantine meets each others eyes and is basically this

Then the meeting starts and Billy feels the magical exhaustion on him. The young boy is kicked out and is told to rest. Constantine volunteers to help Billy “like a Hero would do”. Which is instead a stressful conversation between the two on the way to Billy’s room on how did Billy end up in this situation.

After dropping Billy off, Constantine heads back to the Rayshift Room. When Billy is about to enter, he feels a pulse of familiarity on whoever is waiting on the other side of the room and when it opens to reveal Dr. Romani, Billy is relieved, disappointed, and a foreign feeling of surprise not his own.

Then the whole Rayshift disaster happens but Constantine survived it with a bit more of Chaldea Staff than FGO canon because of Constantine’s quick reactions.

When Billy ends up at Singularity F, he realizes that he can’t transform into Captain Marvel and scrambles to learn how to play the support role as a Master Candidate.

Lots of events happen and in the end, Billy realizes that he has to help Chaldea with the Singularities as himself instead of Justice League member Captain Marvel. Anticipation, excitement, fear and worry flood his veins as he goes on a journey of self-discovery and what it means to him to be a hero and magic user Billy Batson.

——

That is basically what I have for the beginning of it all without divulging into the main story of FGO.

Few other things I want to mention about this AU/Crossover idea

Billy can’t transform into Captain Marvel during the Singularities.

This is to make sure that Humanity is judged by themselves and not through the “Blessed Human of the Gods”. Also if Captain Marvel is in a Singularity for a prolonged period of time, the Singularity may destabilize and that would be an entirely new threat that no one is equipped to deal with. Plus Billy hasn’t made a contract with Shazam at any point when the Singularities happen. So no transformation but the Gods can send messages into Billy’s head/influence him to an extent.

The Gods look at Billy during the Rayshifts as “Ah, yes. Master of Chaldea. How can we assist you and have fun on your journey to restoring Humanity’s growth past 201x?” and “Who is this child that feels like blessings we don’t remember gifting? He feels nostalgic and anticipated. We shall send impressions on him to know that he has our support”

During the present day, Billy can transform into Captain Marvel whenever he pleases.

Summoning Servants

((Edit: added the Roman Servants cause I forgot about them when making this post somehow 😖))

When Billy can perform his first summoning, Medea is the first Servant to answer his call. Then later in Chaldea, Heracles is able to answer and followed by Artemis-Orion after the dumpling event. Chaldea notices how Greek Servants flock to Billy and wonder why.

Their curiosity grows as Roman Servants follow soon after. Romulus and Nero dot on the boy like their own kin. While Caesar flaunts like a peacock to impress an oblivious Billy whenever he gets the chance to in battle. Which is something that the Chaldea Staff did not need to see.

When Billy reveals himself to be Captain Marvel with the blessings of Greek and Roman Gods, then Chaldea understands that this boys is a walking catalyst for any Greek and Roman Servant.

State of John Constantine

John Constantine is in a coma after the explosion. He doesn’t wake up until the middle of the Okeanos Singularity. Has an internal breakdown when learning about the state of the world. Swears a storm when he realizes that Billy is going through Singularities as himself and can’t transform into Captain Marvel for extra protection.

When he recovered enough, he sets himself up as the main Justice League representative and starts building a report to give to the League. Hopefully this will help Chaldea from being perceived as a threat under the eyes of the Justice League and give them some protection. Everyone at Chaldea deserves it when (if) they are able to clear the Singularities and restore Earth to how it was before.

In the meantime, Constantine helps out where he can around Chaldea. But mainly watches over Billy to make sure he is doing alright outside of Singularities. During Singularities, he observes with the rest of the Chaldea Staff. Takes over for Dr. Romani and Da Vinci when there are pockets of travel/downtime in the Singularities for the two to rest a bit.

In the Minute Singularities, Constantine is sometimes dragged into them if the Threat level isn’t too high. Why? Completely by accident via Chaldea Servant chaos. He would be also traumatized by the Halloween Singularities if it wasn’t for the good alcohol in them.

Situation with the Watchtower

Since the Watchtower is in space, and farther away from any satellites, it isn’t affected by the mass sleeping effect on Earth. But in turn, anyone on Earth is affected by the sleeping effect. Meaning Superman, Impulse, Martians, etc. are affected. Normally that wouldn’t be a problem, but when the phenomenon on Earth happened, most of the Superheroes and vigilantes are on Earth to deal with a major problem.

Who is left in the Watchtower while Chaldea clears the Singularities depends on the writer. For me, I think Black Canary, Dolphin, Martian Manhunter, Donna, the Outlaws (old and new), and most if not all of the Earth Lanterns. Plus some Heroes who have future vision/clairvoyance high enough to notice a disaster swiftly approaching and have enough time to get to a Zeta Tube.

—

Well this is it for now. Might make a part two depending on how I feel.