Iridium Armour is a Tau Battlesuit wargear upgrade that fits a Battlesuit with additional protection in the form of iridium armour plates across its surface. Iridium Armour significantly increases the resilience of the Battlesuit's external armour to the point where it can shrug off all but the heaviest firepower. This enhanced protection comes at the cost of a decrease in manoeuvrability due to the armour's increased weight impeding the function of the Battlesuit's Jetpack. Iridium Armour is an upgrade only available to Battlesuit pilots of the rank of Shas'vre or higher, and its rarity means that its distribution is usually limited to only one per Hunter Cadre. However, further refinements of the upgrade's technologies resulted in the development of the XV89 Crisis Battlesuit variant tha