Instead Of Usual D20 Dice, We Use Different kinds of dice's mostly D100 With Roll Modifiers. All combat and rolling for skill checks is always done with D100 Dice. And this can be modified by either positives or negatives.
Say you have +10 roll modifier, you would then roll once D100 Dice and +10 would be your modifier.
There are also cases like Hitchance, that uses totally different Dices like 85D and so on, to make it feel unique.
Or if your are harvesting resources, or looting an dead body. They use 1d4, depends the situation.