The Princess Posse's alliance with Team Retribution - named 'The Good Guys' by Donut and immediately renamed by Ferdinand, with no takebacks.
The truce that keeps Carl and Donut inside the city. Team Retribution sends the offer; Princess Donut accepts it before Carl can finish his sentence, and the system confirms the consequence: they are in an allied city, and if they remain allied with Team Retribution they will no longer be removed from Larracos at the end of the Ceasefire. Every white NPC dot on the map flashes and gains a green glowing outline.
Then the naming fight. Warlord Donut of the Princess Posse names the truce 'The Good Guys.' Immediately after, Warlord Ferdinand of Team Retribution renames it 'Ferdinand and his Bird' - and Donut cannot change it back. Carl tells her not to worry, since Juice Box will probably murder Gravy Boat at any minute; Donut concedes only that Ferdinand does have a bit of an annoying personality. A trade request from Team Retribution follows immediately.
Mechanically it is the Posse's only alliance against The Bloc's eight teams - and under the endgame rules an alliance can never take the Throne Room, so it is a survival arrangement, not a path to victory.
The chapter's decisive diplomatic act: the alliance that lets the Posse stay in Larracos, and the joke about who controls the paperwork.