BannerlordMissions.OpenCustomBattleMission( string scene, BasicCharacterObject character, CustomBattleCombatant playerParty, CustomBattleCombatant playerParty, bool isPlayerGeneral = true, playerSideGeneralCharacter, "")
MissionState.OpenNew("AnyName", new MissionInitializerRecord("scene_string"), (Mission missionController) => new MissionBehaviour[] {});