I will keep suggesting my awesome ideas.
Ok, so Im quite sure the feature if this be a territory bonus, a fort, etc.
What the essential effect I want, is a singular territory to gain all the troops of all adjacent territories.
So lets picture territory X, territory X has adjacent territories: A, B, C, D, and E. For all territories adjacent to X that are FRIENDLY, territory X absorbs all their troops leaving them as one's.
This could be a territory power, like auto deploy, except instead of auto deploy 1... its absorb all adjacent troops... at beginning of turn? end of turn? probably beginning. So i start my turn with 3 on X, 2 on A, 3 on b, 1 on C, 4 on D, and 2 on E. X absorbs 1 from A, 2 from B, 0 from C, 3 from D, and 1 from E making X now 10 to go, and all others 1. If it is a territorial power, than having these absorb territories next to auto deploys is particularly powerful. ... perhaps.
This could also be a forting option. Which I might prefer.... i Dunno
So at the end of a turn, you pick a territory, and it absorbs all players units adjacent to the territory, or all friendly? Should you be able to steal friendly teammates units? red absorb green? probably not, isn't right.
But basically, you can just amass troops in other ways.
I'm playing with the idea in my head still