Reward: The firebase is permanent: the gang unlocks one extra Heavy Intercessor slot beyond its normal caps, may deploy one free defensive emplacement or barricade in every battle, and gains a permanent bonus to any territory-defence roll. This sub-plot can be claimed only once per campaign.
Trigger. Across the campaign the gang invests in its firebase, acquiring three of the Chapter's siege assets — a Centurion, a Tarantula sentry, a set of siege shields, the Vigil Banner, or a fortification territory — across separate post-battle sequences. The war-band has stopped being a mobile force and become a fortress.
Reward. The firebase is made permanent. The gang unlocks one extra Heavy Intercessor slot beyond its normal caps, may deploy one free defensive emplacement or barricade in every battle, and gains a permanent bonus to any territory-defence roll. This sub-plot can be claimed only once per campaign.