The climax of the A Realm Reborn expansion inFinal Fantasy 14used to be a bit different from what it is currently. Players would go through a huge dungeon filled with tons of dialogue that could last for a literal hour to witness the story’s final moments in The Praetorium.

But this was changed during the Endwalker expansion, where this huge dungeon was split into a more condensed version, with the final fights now available in the Porta Decumana Trial. Available through the Main Scenario Roulette, this story-based Trial is a fitting end to the game’s very first storyline.

The Ultima Weapon looking at the camera in Final Fantasy 14.

How To Unlock Porta Decumana

The Trial isautomatically unlocked after completing The Praetorium dungeon. Both are obtained during The Ultimate Weapon quest, the final one in the A Realm Reborn MSQ, so you’ll automatically have access to it by simply advancing in the game.

you’re able to enter it through the Duty Finder, and can also randomly get it during Main Scenario Roulettes.Some cutscenes are unskippable.

The Ultima Weapon fighting the Warrior of Light in Final Fantasy 14.

Porta Decumanadoesn’t appear in the regular Trials Roulette.

Porta Decumana Guide

Porta Decumana is a bit different from other Trials so far as it’smore of a final spectacle than a proper fight during its first minutes. The first phases are semi-automatic, anddamage is only really required for the final phase.

The Ultima Weapon will use its three Primal’s attacks, cycling between them after exhausting their powers in an attempt to defeat you.Once it’s out of Primals, the battle shifts to the final phaseafter a cutscene. Here are all the attacks for the whole encounter:

The Ultima Weapon alongside Ifrit in Final Fantasy 14.

Geocrush

Proximity AoE

Marks a point on the arena to deal AoE damage. Move away from the marked point to reduce damage taken.

Landslide

Line AoE

Summons Titan to use its signature smash on the ground. The Weapon itself will later repeat the attack.

Weight of the Land

The Ultima Weapon’s final phase in Final Fantasy 14.

Circle AoE

Various circle AoEs appear across the room. Dodge them as needed.

Granite Interment

Special

Used once it reaches 80% HP. Locks down all players inside gaols. It later attempts to use Earthen Eternity, but fails and loses Titan’s powers.

Eye of the Storm

The Ultima Weapon defeated in Final Fantasy 14.

Covers part of the arena with a blue circle, leaving only a safe spot in the middle.

Mistral Shriek

After using Eye of the Storm, summons Garuda to use an AoE around herself. Stand away from her but inside the safe zone in the middle.

Vortex Barrier

Used around 55% HP. Becomes invincible to all attacks. It attempts to use Headman’s Wind, but fails and loses Garuda’s powers.

Radiant Plume

Similar to Titan’s Weight of the Land, but fire-themed. Dodge in a similar fashion.

Vulcan Burst

Knockback

Ifrit appears in the center of the arena and pushes all players back. Stay next to him at the center after he appears.

Radiant Blaze

AoE

Used once the Weapon is around 30% HP. Launches an unavoidable attack covering the whole area. You’ll be shielded once again, and can burst down the Ultima Weapon.

You can still attack the Ultima Weapon during his Radiant Blaze cast. Once Ifrit is out, keep attacking the boss.After it loses enough health, it triggers a new unskippable cutscene, entering the final phase of the fight:

Ultima Weapon Phase

The Weapon uses a variety of moves here,but none are considerably lethal:

Homing Ray

Target AoE

Targets all players with a circle AoE. Stay away from each other and heal after it explodes.

Aetheric Boom

Pushes all players back and summons two pairs of orbs tethered to each other. Touch them to pop them before they encounter each other.

Laser Focus

Stack AoE

Stack damage targeted at the healer. The whole party must stack with them.

Citadel Buster

Point-Blank AoE

A direct laser in front of the weapon, immediately after the previous attack.

Magitek Bits

Summons various mechanical laser shooters across the room. Dodge them as usual.

Explosion

Uses four proximity markers at each corner of the arena. Run center and wait until they explode, then dodge again as the Weapon follows up with anotherCitadel Buster.

After Explosion,the Weapon simply repeats its attacks with nothing new, sometimes overlapping some of these attacks, so be careful. It only gets a final attack once it reaches 30% HP:

Ultima

After reaching around 30% of its HP, the Ultima Weapon attempts to use Ultima again. At the same time, you’ll be granted a full Limit Break 3. Any DPS (Melee preferably) should use it to defeat the Weapon once and for all. Don’t bother about healing and just kill it.

Once it starts its final Ultima attack, you’ll receive the Limit Break bars once the dialogue ends.A DPS Limit Break 3 must be used to meet the DPS check. Otherwise, you’ll be wiped and have to restart from the Ultima phase once again.

Porta Decumana Rewards

There are no specific rewards for clearing Porta Decumana. However,the Main Scenario Roulette is notable for granting some of the best experience points out of all Roulettes in the game. It can take a bit longer than other duties, but it’s worth it when leveling your Jobs.