Tyranids: Biovore

The Tyranid Biovore is a squat, bloated, living artillery creature that nurtures and launches explosive, gas-bloated Spore Mines at the enemy. 
Physical Appearance
Body Structure: The creature has a lumbering, heavily armored form, sometimes described as spider-like or having a gorilla-like frame in older depictions. Its body is swollen with a spore-sac bulging with biological explosives.
Size: An average Biovore stands about 2 meters (approximately 6.5 feet) in height and weighs around 2 tonnes.
Limbs: It possesses chitinous spurs or "talon-barbed legs" that it digs into the ground to anchor itself, likely to absorb the recoil from launching its payload.
Dorsal Launcher: A symbiotic launcher is mounted on its back, from which the Spore Mines are expelled in violent muscle spasms.
Head: It has a sunk-in head, and older models were noted for an "overbite jaw," which some believed implied a connection to Orkoid genetics assimilated by the Hive Mind. 
Function and Role
Artillery Support: The Biovore's primary role is indirect fire support, acting as the Tyranid equivalent of conventional artillery.
Spore Mines: The creature's "ammunition" are the Spore Mines, which are essentially living bombs. They are launched in high arcs across the battlefield, where an internal gas bladder inflates, allowing them to drift gently down.
Detonation: The Spore Mines do not typically detonate on impact, but rather when a non-Tyranid life form draws near. They explode in a shower of bone shards, toxic gas, and corrosive fluids, creating hazardous areas on the battlefield to deny enemy access to specific zones.
Resilience: Despite being somewhat sluggish, Biovores are heavily armored and possess regenerative capabilities, making them resilient to enemy fire. 
The Biovore kit can alternatively be built as a Pyrovore, a creature designed for close-quarters chemical fire rather than long-range artillery.