Silverfish overhaul

The silverfish is pretty useless right now. So why not give them an overhaul where they get an own Cave biome where different kinds of silverfish can spawn each with unique designs and unique attributes. Some are smaller, some bigger, some faster, some slower, some make more damage, some less. Their could also be a new mob that summons Silverfish in waves, so you could have a dungeon and a boss. Maybe also that silverfish drop silver gunpowder that is stronger than the Normal gunpowder dropped by Creepers but has a rarer chance to drop. With it you could make stronger tnts and rockets. With the new Cave biome you could also add new blocks like a silver block for a new ore, also building blocks.