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Theron is a gas giant planet of the Imperium.
The Adeptus Mechanicus maintains a number of Arco-Refinery Platforms suspended in Theron's upper atmosphere which act as lightning conductors, storing massive amounts of electrical charge. At one point the planet was invaded by a force of Orks, with the greenskins attacking from a number of Roks that they had guided into the atmosphere. It was believed by the strategos of the Departmento Munitorum that the Orks wanted to capture the planet's arco-refineries so they could refuel and rearm before continuing corewards.
The planet's PDF was bolstered by a local Imperial Navy battlegroup and a force of Space Marines — the Wolf Lord Kjarl Grimblood dispatched eight packs of Space Wolves from his Great Company, the Grimbloods, to aid in defending the Platforms and they were joined by a Deathwatch Kill-Team led by Caius Vorens.
- Arco-Refinery Alpha 1-1 — the foremost refinery on Theron
- Platform Beta 13-11
- Platform Epsilon 5-1 — assaulted by Orks
- Platform Epsilon 9-17 — defended by Kill Team Vorens and the Flame Hunters Skyclaw pack from Orks
- Platform Kappa 6-8 — contact lost
- Platform Omega 15-0 — assaulted by Orks