How would i get around doing chances?

So i wanted to do a roll system with chances and i did it with math.random but i figured that it wasn’t that fair since every ability has the same percentage of being obtained, how would i get around doing it percentage based? right now i’ve done it like this:


then it gives you the ability.


I recommend checking out this Community Resource. It allows you to create a Loot Plan with rarities. It might fit into your use case.

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