The large, mushroom-shaped structure on the Swarm Host’s back is a breeding ground that weaponizes the millions of diminute larvae inhabiting the creature’s bloodstream. Through a simple system of membranes for matter exchange, glands that pump the offspring full of hormones to hyperaccelerate growth, and ducts for efficient transportation to the bubbling pockets on the surface of the Incubator, the Swarm Host births deadly, short-lived Locusts to destroy threats to the Swarm.
The legs of the Swarm Host boast powerful muscles that allow them to vibrate at hypersonic speeds, not unlike the teeth of the Nydus Worm. Despite that, the creature couldn´t burrow fast enough to adapt
to shifting battlefield conditions. To correct this, a set of fragile—albeit regenerating—capillaries was put into place. Now, when the Swarm Host digs, the capillaries break and the creature’s acid blood softens the soil, allowing it to go underground in seconds.
Flexible osseous structures of varying thickness slide and lock into position when the Swarm Host prepares to strike. Bearing a resemblance to Terran Siege Tank hydraulics, this specialized skeletal system allows the Swarm Host to maintain position and balance when spewing Locusts or when under heavy fire.
Millions of these diminutive larvae swim through the acid bloodstream of the Swarm Host, feeding off of damaged tissue, sealing wounds, and destroying anything foreign that may enter their domain. When the creature is threatened or engaged in combat, a subtle chemical reaction signals the larva to head for the Incubator, where they are evolved into living weapons.