How would i get around doing chances?

[Jerememez (Sekiro)]

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.

[NurZwanzigBuchstaben]

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

LootPlan - Random loot generation made easy

LootPlan is a lightweight portable ModuleScript I’ve created to solve any loot generation needs you may have. The module has example scripts, but most heavy documentation will be in this post. The documentation is detailed to make sure nothing is missed, but you can probably get the jist of it by simply skimming over it, or looking at the code examples. The system is quite simple, with the module code only taking up ~150 lines. Classes There are two classes of LootPlan; “single” and “mult…