Whoa rival faction that Krieg has ground down, or an Imperial commander who despises the Korps' wasteful attrition — a blood-feud, phase-gated
Termscampaign-level enmity: while it stands, the two gangs may not agree map-level non-aggression and each gains a reputation bounty for taking the other's fighters Out of Action; the feud escalates the grind between them battle by battle
The Butcher's Bill is the enmity the Korps earns from those it has ground down, or from an Imperial commander sickened by its wasteful attrition. While the feud stands, the two gangs may not agree any map-level non-aggression, and each collects a reputation bounty for every enemy fighter it takes Out of Action across the front. The grind between them worsens battle by battle, a ledger of the dead that neither side will close until one of them is spent entirely.
The Siege Pledgealliance
Whoan allied Imperial force committed to a grinding front — the Inquisition, a line Regiment, a besieging army; any such faction, phase-gated
Termscampaign-level attachment pact: while it stands, Krieg lends its siege-line to the ally to hold or break a fortified position between battles, granting the ally a dug-in defensive slot; Krieg gains a favour in exchange — the penitent regiment seconded to a campaign's hardest ground, not a fixed pairing
The Siege Pledge binds the Korps to an allied Imperial force set on a grinding front — an Inquisitorial warband, a line Regiment, a besieging army. While the pledge holds, the two gangs may agree map-level non-aggression, and the Korps lends its dug-in siege-line to hold or break a fortified position between battles, granting the ally a prepared defensive slot on ground it could not otherwise fix. In return the Korps is owed a favour. It is a penitent regiment seconded to a campaign's hardest ground — no fixed friendship, only a shared front and a debt of labour.