RPG Artifacts/Spirits

So, if for example, I wanted to add a custom page, where you can equip artifacts/spirits that give you stats/abilities, how would I do that? An example would be like (the only thing I can think of at the moment) in xenoblade chronicles 2, where you can equip blades that give you special effects. I don't know how this would be done in a mod. Any help would be welcomed. I am currently trying to make an rpg mod, and I want to add these types of things.