After setting up the Guild’s Fort, Guild Masters, Vice Masters, or Quartermasters are able to set up defensive and supporting structures known as Annexes. Any guild member is able to check the status of the fort and its annexes via their world map, provided they are on the corresponding node war channel.

Most annexes can be purchased from any NPC, just like a fort. There are various annexes such as Recovery Center, Cannon Observatory, Hwacha, and Flame Tower. You can build more annexes if the fort has a higher annex capacity.

Recovery Center (Size: 1)

It can be built near the fort (command post).
It affects the amount of HP recovery when a guild member dies and chooses to revive near the fort. Guild members will revive with 1% of their HP filled without a recovery center, but the recovery amount will increase by 25% each time a recovery center is built. It is possible to revive with full HP if there are four recovery centers.
Recovery Center might not be very effective since it is only useful when someone dies, but it is a powerful annex that can instantly work when your fort is destroyed by enemies.

Cannon Observatory (Size: 3)

It can be built near the fort (command post).
You can produce cannons by interacting with this annex after the Node/Conquest War starts. (Cost applies per item, which will be deducted from the guild fund.) Production time is 5 minutes, and the cannon will be put in the producer’s inventory.
You can produce as many cannons as you want, but only one cannon is allowed per cannon observatory. If you want to produce more cannons, you will need more canon observatories.
An itemized cannon is valid for 4 hours by default, and any summoned cannon will be automatically destroyed after the Node(Conquest) War ends.
A shell is required to operated a cannon. Shells can be produced through in-house manufacturing. Since it can effectively destroy enemy’s manned and siege weapons, it will be helpful if you learn how to maneuver it correctly.
* What if you were producing and using cannons, but your cannon observatory was destroyed? You cannot produce any more cannons, but you can utilize what you have at the moment.

Cannons produced in Canon Observatory can be installed anywhere.

Elephant Nursery (Size: 5) 

It can be built near the fort (command post).
You can summon an elephant from the guild stable every 12 minutes after the Node(Conquest) War starts. Please note that once the Node(Conquest) War starts, all the guild elephants in the same channel will be force-moved to the guild stable. (Not applied when they are not in the siege channel.)
You can build as many elephant nurseries as the number of elephants your guild has. If the guild owns 2 elephants, you can build 2 elephant nurseries.
Please note that elephants will be randomly selected and summoned to the nursery. If you have 4 elephants in the stable, one of them will randomly be summoned.
In order to summon an elephant, one of the guild members has to interact with the nursery. According to the mount rules, only one elephant is allowed per guild member.
* What if you were using elephants and the elephant nursery is destroyed? You cannot produce any more elephants, but you can use what you already have.

Despite its adorable appearance, an elephant is one of the most powerful siege weapons.

Flame Tower / Hwacha (Size: 3)

Flame Tower and Hwacha act as a bunker that protects the fort. One of the guild members has to mount these installments to directly maneuver them, and they will deal massive damage against the enemy.
Flame Tower has a short range, but it is effective and powerful enough against close enemies. Hwacha has excellent range, and it is much more effective against far-reaching enemies rather than closer ones. In order to use the flame tower and Hwacha, you must purchase Flame Tower Fuel and Shingijeon from the Guild Shop, respectively. Flame Tower requires a warming up time of 3 seconds after each launch, and Hwacha requires 10 seconds.
Please note that the characters that maneuver Flame Tower and Hwacha will not get damaged until the ordnances are destroyed.
Flame Tower and Hwacha need to be directly maneuvered by guild members. Flame Tower is effective against close targets, and Hwacha is effective against far-reaching targets. Use them wisely. Characters mounting Flame Tower and Hwacha will not be damaged.

Supply Depot (Size: 5)

As the name suggests, Supply Depot supplies various items necessary in a Node War.
First of all, it lets you use the Guild Shop. That is, you can quickly buy ammo for Flame Tower or Hwacha as well as guild-only potions. Only Vice Master or higher-ranked person can use the Guild Shop.
Gear repair is the next. Gear’s durability will be quickly consumed when you are actively engaged in a battle, and this function will allow you to fix your gears on the spot. Repair function is available to all guild members.
Lastly, the stable. Please note that you cannot remote-withdraw or check out a horse in other regions through this stable. It only lets you revive horses and camels died during the Node War or Conquest War. All guild members can use this facility.

A guild member needs to directly interact with the Supply Depot to use its functions.

Other Annexes (Size: Varies)

In addition to the previously mentioned annexes, there are more kinds of annexes for the fort, the most important one being a barricade. Surround the fort with the barricades so that the enemies cannot easily approach or attack the fort. After installing them, barricades can be upgraded to steel barricades, which have dramatically improved durability, and are excellent for your defensive plan. Barricades take up 1 grid space, and up to 50 of them can be installed depending on the type of the fort.

Siege defense tower is a grounded unmanned siege weapon. Your job is done after installing it. It will automatically attack the approaching enemies. Then there are various traps. These traps can be planted anywhere regardless of the fort location, and they can also be used anytime, even outside the Node(Conquest) War. Elephant Trap is a particularly useful siege weapon, disabling an elephant for a moment.

Each fort has a designated capacity for installments and annexes.

Consider the size of an installment and the geography of the area when building your base.

Managing these installments effectively will bring you closer to the victory.