I always wanted something similar to mycelium, that spread and infected the map. Even before notch released mycelium, I thought it would be cool if the nether infected from the portal , and you had to destroy it and fight back mobs that spawned on the newly taken nether. But when this was made, I was sure it was going to work exactly like I want and invasion type biome. Sadly , it was decided not to behave like a lot of people thought it would ,and doesn't spread and takeover the world. What I would like in a plugin is these key points mycelium slowly infecting blocks, probably limited to grass, and expanding things such as trees , shrubs, etc turning into mushrooms or at least being eliminated making it a challenge for players to fight back, but also give ways for the player to deal with it better then just block by block ( lava or something) hostile mobs spawn on it to fight back, maybe even buildings made from mushrooms Please give any further ideas/comments!