A Phased Ion Gun is a T'au Ion Weapon developed as a primary weapon system for the XV9 Hazard Battlesuit that is capable of engaging enemies at range with high energy ion streams, vaporising flesh and metal with equal ease. These high-energy particles are accelerated by an electromagnetic field and react explosively with the target as a result of the direct transfer of energy at an atomic level. The Phased Ion Gun was developed during the T'au Empire's Third Sphere Expansion and based on the Ion Weapons technology acquired as part of a fruitful alliance between the Syrr'Tok Brotherhood of the Demiurg and the Water Caste of the Dal'yth Sept.
A Phased Ion Gun is a prototype weapon system designed specifically for use by XV9 Hazard Battlesuits, as their advanced power cores allow them to most effectively use these weapons. The Phased Ion Gun melds the rapid-firing technology of the Cyclic Ion Blaster with the power of the vehicle-mounted Ion Cannon into a stable Battlesuit weapon system.
The lengthy particle accelerators that comprise the Phased Ion Gun's mechanism allow the Battlesuit pilot to engage the enemy at range with a storm of projectiles that react explosively at an atomic level, decimating heavily armoured infantry and vehicles. While the rate of fire is stable and very high, the ionisation effect remains unpredictable and varies due to the developing nature of this still-experimental technology. At its peak, a Phased Ion Gun's energy streams are able to bypass virtually all forms of armour. Whilst a Phased Ion Gun is similar in its tactical role to a Cyclic Ion Blaster, it sacrifices some of the latter’s rate of fire for extra damage per shot.
- Codex: Tau Empire (6th Edition), pp. 66
- Imperial Armour Apocalypse II, pg. 58
- Rogue Trader: Tau Character Guide (RPG), pg. 37
- Battlefleet Gothic Magazine 19, pg. 9