Single Spell Sorcerer
The Celestial Express has a Navigator.
The Navigator can grant wishes.
Jax has no memories, a wish he needs granted, and a single spell to aid him on his journey.
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The Celestial Express is a train that goes from one galaxy to the next, picking up passengers and settlers. It's Navigator, the one who drives it through the stars, is a God.
Jax arrives on the celestial express with no memories but a single wish to save someone. after learning what the navigator is capable of, he decided to go find him.
But to find the Navigator, he must go through 10 different Carriages, all of which are a world in its own.
and because he is an irregular passenger, he must do it with a restriction named 'Single Spell Sorcerer'.
Using only one spell, he must cross the 10 carriages, find the navigator, and get his wish granted.