Expert Mode Silverfish

Silverfish, a mob usually only ever encountered in strongholds and the rare extreme hills biome, is now festering across all of the overworld! They have a very small chance to spawn when stone is mined, which can lead to a deadly infestation. Silverfish now have the ability to not only burrow into stone, but multiply in it. When faced with an infestation, it will often take creative solutions to fight them off, from using explosions or lava, to building perimeters, etc.