Defiled Lands
Requires the mod Baubles.

This mod introduces various defiled biomes to the world, inhabited by dangerous creatures, exotic plants, and hidden treasures.
These territories have a unique property - they gradually transform blocks within their boundaries. Here you can find rare resources used to craft powerful weapons and tools. The most valuable items become available after defeating a special boss.
Frequently Asked Questions:
- Question: Do defiled lands spread?
- Answer: Yes, but only within a few blocks of their natural boundaries unless configuration settings are changed.
- Question: How to stop defiled lands from spreading?
- Answer: They don't spread more than 3 blocks from their original boundaries. Blocks placed outside natural biomes don't have the ability to spread.
- Question: Can defiled blocks be used for decoration?
- Answer: Yes, if you're outside the natural biome. Inside the biome, they will spread, which might be undesirable.
- Question: Is the mod compatible with other biome mods?
- Answer: Yes, it works with most mods that add biomes, including Biomes O' Plenty.
Special thanks to Rhodox for permission to use modified assets from the Painterly Pack.