"GODS"
So, like critical role, gods were banished from the material plane (this dimension) and can't interact with it directly. Those who didn't get the hell out of dodge when they were supposed to are essentially powerful immortals, but they aren't gods with the power to like... reshape reality.
Other creatures like angels, demons, etc, can also fit into this category.
Plot here if you want to use it or be connected to it in some way!