Something very important please readWant some suggestions

So my first question is

Mc is going to create a reality marble or Domain Expansion. So what should be able to control inside it, and it should be one thing like

Ionioi Hetairoi: This is a reality marble possessed by Iskander (Alexander the Great) in "Fate/Zero." It creates a vast battlefield where Iskander's army, the Companions, is summoned, and they can interact with the real world.

Lord Camelot: A reality marble used by Sir Lancelot in the "Camelot" story arc of "Fate/Grand Order." It creates an impenetrable fortress, shielding the user and allies from harm.

Unlimited Blade works: An ability possessed by Emiya Shirou in "Fate/stay night." It's a limited form of reality marble that allows him to access a vast armory of weapons.

And it should be related to his origin so it should only be one thing and related to origin whatever it may be.

And the reality marbles above are just examples of what reality marble is and his reality marble be totally different.

And second question so when he world travels should Beru be part of of team if yes then it be cool and I be able to show some shadow character development.

If not then when he returns and raid of Juju island starts he will be able to feed him dragon and other super powerful species corpses angels, devils, fallen, demons, vampires and many more making him super OP and dragons will fly around Asia to kill the ants who escape from the island

PS: So it's your choice so please vote and don't forget to put suggestions on what his origin would be as it's related to reality Marval.

Thanks

Author out.