Daemonic Possession
This upgrade cannot be chosen for open-topped vehicles. The vehicle does not have any crew, instead it is possessed by a Daemon. Hatches are all welded shut and sealed with runes and sigils. The vehicle may no longer transport any troops. The Daemon controls the vehicle and may ignore 'shaken' and 'stunned' results. A vehicle may be subject to both parasitic possession and daemonic possession.