Spore Mines (Boletus minoris in High Gothic) are a Tyranid support and disruption unit. An internal gas bladder allows them to drift, seeking the proximity of a non-Tyranid lifeform. Spore Mines possess a rudimentary intelligence and are full of poisons, toxins, viruses and chemicals.
The Spore Mine will undergo a brief chemical reaction to convert its biomass to an intense Bio-Plasma blast. Good for killing enemy units in buildings.