Diablo 4 had Rifts and Adventure Mode
If you're placing points into, say, the Barbarian shout skill you see in the demo, at the start Diablo 4 Gold it is fairly straightforward and perhaps short duration that affects all of your party members, but since you put in more rankings, it gets stronger. Perhaps the radius goes up a bit. Perhaps you begin unlocking new types of things, like you go unstoppable, so you're resistant to...