Coal deposits under ferns

This suggestion aims to add a subtle, lore-friendly layer to resource hunting by linking coal generation with ferns (both small and large).

The Mechanic:

• Hidden Deposits: There is a small chance for a coal vein to generate directly beneath naturally spawned ferns.

• Depth: These specific veins would be located roughly 5–10 blocks below the surface, making them a reward for observant players.

• Rarity: This should be a rare occurrence, not a guaranteed find, to maintain game balance.

• Natural Only: This feature only applies to ferns generated during world creation, preventing players from "farming" coal by manually planting ferns.

In the real world, coal is formed from ancient plant matter, specifically giant ferns and mosses from the Carboniferous period. Introducing this mechanic would provide a clever nod to real-world geology and reward players who explore the surface with a "survivalist" intuition. It doesn't replace the current ore distribution; it simply adds a small, immersive bonus to the world's generation.