It would be cool if this mod had the option to enable pvp based chunk conquering.

What I mean by that is, that opposing parties should be able to claim chunks of another party given a certain condition.

I believe the "factions" mod implemented this with a timer after a player of a party dies. Once a player of one party dies, an opposing party can claim chunks of that party until the timer runs out.

Thanks for the suggestion.
I probably won't build a feature like that into the mod but I can consider adding necessary API for other mods to hook into.

is there a way to claim chunks for a certain party as an admin?

i.e. party 1 "wins" a battle for a city against "party 2" and the server admin claims the chunks of party 1 for party 2 related to that city?

Parties don't own claims, each player in a party has their own claims, so this would be tricky. You can unclaim any chunks in admin-mode and then claim as any player online using the vanilla /execute as ... command prefix, if you're OPed.

Ahhhhh then I misunderstood the mod!

but okay, that works. I assume „allies“ are then other party members?

The allies of a party are other parties.