Ground unit of xerjs with arms-blades. Moves on the surface of the planet at low speed, helping to spread creep colonies and to build a defense, reducing the time of construction. Can be transported by a Lurker. It enters into the battle only being on the object: satellite, planet or asteroid. About 50% of the Hydralisks are self-restorable after the fight, and the rest will not give debris and battle experience to the enemy. They cover the sources of damage with their bodies in case of gravitational damage to the structure of the object with diametr upto 100km and they stand under the gravitational beam or under collision. In this way they increase the structure of the object by the value equal to the half of their own armour.