Purgation of Chyria

The Purgation of Chyria was a joint Imperial retribution campaign carried out by both the Penitent Knights and Templarii Scientae Chapters against the rebellious Chyria System that seceded from the Imperium of Man. When the Astartes besieged the system's forge world and put down the rebellion of rogue Adpetus Mechanicus elements, they discovered an ancient STC for the Skylance and Stormbird. Utilising this recovered knowledge, the Templarii Scientae was able to design and construct the 'Skybreaker' pattern gunship.

History
When called to join a small Crusade to put down a rebellious Imperial System, the Penitent Knights were hesitant to join the slaughter, but the Council of Lords concluded that they had turned from the Emperor, and they had chosen their fate, mournfully. And thus, the Orders of the Cleansing Flame and the Dawn were dispatched to the troublesome System and were met by another Astartes Chapter, the Templarii Scientae, or "Templars of Knowledge" in Low Gothic. Together, the rebels of the Chyria System were ravaged and laid low, but ultimately spared from a much harsher fate that would be delivered by another Chapter. Only those that had taken up arms against the Imperium were killed, and any that repented for the sins of their System were allowed to live.

When the Knights and Templarii besieged Chyria's Forge World, the Astartes discovered something in the vaults of the rogue Mechanicus. Blueprints to the same Standard Template Construct once used by the Skylance and Stormbird Aircrafts. The Knights let the Templarii take the plans freely, stating that it fighting alongside such tenacious warriors of the Emperor was its own reward. Millennia of research and slowly accumulating knowledge, allowed the Templarii to design and build the so called "Skybreaker Gunship", a ship that has been adapted to the now chapter-sized forces of the Imperium, rather than legion-sized. It sacrifices transport capacity for more weapons. This design has quickly proven itself to be very versatile. Up until now, the Astral Warriors, the Penitent Knights, who now have established close relations since several more cooperative campaigns, and the Templarii themselves.