How to make a domain expansion?

How can I make a domain expansion like the one from jujustu kaisen? I woudl like tutorials or videos with not just toolbox but also explanations. I been searcihing for quite some time now but I coudn’t find anything. If anyone knows how to make it then please tell me and don’t just say what I need to learn beacause I know most of it, I am just not sure how to put it all in one piece of code. Anything woudl help.

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