The poison mushroom caves

A poison mushroom biome would be cool in the caves featuring sporite, the spore block, and the spore cap mushrooms.

Sporite would be a rare ore found in the poison mushroom caves and when you break it it would send poison particles to the blocks around it and if you got hit you would be poisoned. It can be crafted to make the poison edge sword which does the damage of an iron sword but then leaves a poison effect on the hit mob. The spore block would be found in the fully grown spore cap mushrooms and would send poison particles to the space below and around it that poisons the mobs and players in the particles. The spore cap mushroom would be an item found in the poison mushroom caves and you can brew it withpotions to give potions the seeping effect. The seeping effect allows the potion to linger and send the potion effect below the bubbles and can go through one block.