Cursed Lands

A few chunks of land where the everyday occurrences are slightly off. For instance the trees are dead and black the ground is podzol, and there is a new mob that wears a pumpkin. Castles will naturally spawn here being similar to the woodland mansion. In these areas there could be some type of material that is very rare and only findable in caves in the area such as amethyst. The area will have 3x the mobs at night making it almost unlivable. It is a late game area.