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.
Swarm Guards
Charged with protecting the Hive Mind, the Swam Guards throws themselves at anything that threatens the Hive Mind. The Swarm Guards are the elite of the Tyranid Warriors, armed with four bone swords that shred through the enemy with ease and able to block incoming weapon fire.
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-weaponry 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 similar in respect, but possess a greater array of bio-weaponry than the Dominatrix. It is believed that the Domina is a lesser Tyranid construct that does not have the psychic aura that the Dominatrix possess. Housed upon the creature's back are bio-weapons capable of taking down a Titan. On either side of the creature protrudes spine columns that spits out acid like spores, acting as a deterrent against smaller prey who dare to approach the creature.