T'au Battlesuits

A T’au Battlesuit is an advanced powered combat exoskeleton that forms an integral part of the T’au Fire Caste’s military forces. T’au Battlesuits incorporate many different types of T’au weapons systems and armour and are the foremost sign of reputation and honour amongst the warriors of the Fire Caste — they are the apex of the T’au’s military technology. Only the greatest heroes of the Fire Caste stride to war in these mighty armoured machines, and they are the pride of the caste as well as one of the most important symbols of the T’au Empire. Battlesuits can easily lay down a withering hail of fire to destroy both infantry and vehicles, and possess the resilience and speed to shrug off heavy fire. Though the armies of the T’au rely on their skimmer-tanks and the airborne gunships of the Air Caste for long range support, the Battlesuits of the Fire Caste are considered to be the most efficient of all their many killing machines.

Source