Hive Mind
It has not been proven that the Hive Mind exists as a single entity and whether destruction of the Mind would result in the remaining swarm reverting to its natural instincts. This bio-construct seems to be the fusion of a brain like creature with a Bio-Titan. This bio-creature is heavily armoured, but its sole purpose is to protect the mind within. Although capable of limited movement, it remains dormant and would only uproot and attack at the last resort.
Even when the Bio-Titan is destroyed or moved from protecting the inner creature, the second shell still proves deadly as it is protected by a multitude of spine columns that spits out acid like spores to protect the inner creature. Once this second shell is subdued is the brain like creature inside becomes vulnerable.
Dominatrix Group
The Dominatrix is a Tyranid species which exerts a controlling psychic aura to bring lesser Tyranid creatures under its will, allowing the swarm under its command to operate with uncanny efficiency and tactical ability. However, a Dominatrix is extremely rare and only seen in the most advanced Tyranid swarms. A Dominatrix possess a large array of Bio-weaponary and packs a colossal mass. It has an intelligence akin to that of a mighty Hive Tyrant, and the link it has to the Tyranid Hive Mind surpasses even the Hive Tyrant. A Dominatrix is a gargantuan composite creature of nightmarish proportions, equipped with ripping claws and fangs, and a stunning profusion of symbiotic weaponry.
The Domina has only ever been sighted with a Dominatrix and is very similiar in respect, but possess a greater array of bio-weaponary than the Dominatrix. It is believed that the Domina is a lesser Tyranid construct that does not have the phychic aura that the Dominatrix possess. Housed upon the creature's back are bio-weapon capable of taking down a Titan. On either side of the creature protrudes spine columns that spits out acid like spores, acting as a deterent against smaller prey who dare to approach the creature.
