Carnifexs

The Carnifex or Carnifex Primus (Carnifex voracio, Carnifex vorantii, Carnifex ululare, Carnifex arbylis, and the Carnifex bilius) is a monstrous creature that essentially acts as an organic main battle tank for the Tyranid Hive Fleets. It is armed with the most advanced Tyranid Bio-Weapons and is used primarily as a shock trooper to carry out starship boarding actions, frontal shock assaults on entrenched positions and for besieging fortified locations or enemy armour formations.