This is an idea and isn't actually gonna be in the game. Im hoping SE reads this and adds this in.

MAIN OBJECTIVE

Main Objective is to slay Wandering Garlean Enemies within the Area until they fall back (Run Away) to there hidden location and tackle the "Random" MegaBoss and slay the remaining troops. The Garleans will be spread around within a zone/zones until they are killed then a camp will appear within a zone where main camp is where they can be battled.

Just like how FFXI had Conquest areas that get taken over by Beastmen but areas in FFXIV will get taken over by Garlean Empire and roam around the area attacking players. People pushing back the armys forces will be rewarded points.

Many locations in each area an army can move to take over. Some of these locations have "Home Camps" when they fallback to there home camp they will get stronger. A Home Camp only can be opened up if all there other armys are pushed back to that location.

A nation that's taken over camps will gain there nation special bonus's and who ever that wins "Special event" will gain Keyitem for "Last Grand Company" Rank.

The new Rank will let you be able to teleport to any 1/3 Aeth Camps on your nation's side for free without seal cost. (Normally teleport cost is 50/100/200 seals).

The New rank will let you buy New Grand Comapany house objects and be able buy special earrings.

Players redoing "Wanderer" will be earned with seals and ranking up there nation. (Something small like 2~30seals depending on level and party size and # of mobs)

Players pushing back Garleans will earn credits to let them do more Grand Company leve quests.

Nations that are having the best Rank will have something special shown within city walls. Statue?

Extra:
The Garlean Empire will recharge to full once a week (RL time)
The same city cant win twice in a row. (Gives chance for other nations that have lower player base have a chance to win.)
A player that's its nation already won before can join another nation for decreassed seals and aid them in Wanderer. There aid will not increase there nation rank but will help them push Garleans back to there home camp.
Some Garlean camps will change there levels depending on how many locations they have under control.
Warnings when a nation has unlocked a Camp. (Lets other players join when they know they are needed)