Haven should have a new biome called the Dark Forest.
In this area you would be able to obtain surface metals of low quality.
Monsters in the Dark Forest would give you increased lp gains and much higher chance of obtaining combat moves.
This area could have more mythical creatures lurking around:
Skeletons, goblins, trolls.
Being in this area would give you a stamina drain debuff so you couldnt just live here.
There should also be a restriction of building claims. Creatures of the Dark Forest would also hate man made buildings and have the ability to bash them.