Well, Axt wants strong warriors, but he can't really make super powerful dragons all over the island.
So he's gonna put them in a deep dungeon, and the best warriors are those who go to hell and back.
And to achieve this, he's going to put 4 parts of a dungeon together.
1. Size, this is always present, and 0.25 Essence is going to be a base cost.
2. Residents, this is optional, and will act as a separate equation.
3. Environment, again, optional, and will act as a separate equation.
4. Locations, optional, and will give better entrance, and such.
So the equation will be:
(Size)+(Res)+(Env)+(Loc) = Cost
Size will always be there, so it's a minimum of 0.25 Essence.
If you have basic in all four, the equation will be:
(0.25)+(0.25)+(0.25)+(0.25) = 1 Essence.
If you want extra size and residents, then it'll be something like:
(0.25*2)+(0.25*2)+(0.25)+(0.25) = 1.5 Essence.
This means you can expand the dungeon, without ramping up the cost too fast.
Size will always be there, you must apply size, or there's just no dungeon.
With big enough size, you can house quite a bit of stuff in there.
If you don't apply Residents, then it wont spawn any residents, all who inhabit it would have to immigrate, so it's mostly mundane creatures, and an occasional extraordinary visitor.
With enough in Residents, you can have a dungeon ecology going on with unique creatures that only live in the dungeon.
If you don't apply Environment, it'll be a muddy cave, or some sort of natural cave, but also a very mundane cave, out of natural resources.
With enough in Environments, it can be a unique location, with magma rivers, void pits, ice columns, etc. It can even be big enough to have towns in, though it's also dependent on size.
If you don't apply Location, then it'll be an unremarkable location, no fancy entrance, and will only be in one area.
With location you can have it be connected to several regions, or, with a high enough multiplier, be located in it's own pocket dimension.
Though it'll take time for something like this to be proposed, supported, and added.