Castrum Marinum is a Trial from Final Fantasy XIV: Shadowbringers, taking place in the imperial castrum of the coast of Cape Westwind in Western Thanalan. It sees the Warrior of Light face off against the Emerald Weapon, a Garlean mecha designed to break the stalemate with Eorzea. The fight was released in patch 5.4 Futures Rewritten.
The liberation of Terncliff has led to the discovery of vital information regarding the Weapon project. A warmachina code-named "Emerald" is believed to have escaped by sea to an imperial installation, so you and Gaius make your way to Castrum Marinum, one of two likely locations. Retrieved data suggests that your foe is armed with floating manipulators, though how exactly these will be employed in battle remains to be seen.In-game description
Not content to face a gigantic warmachina armed with an assortment of deadly blades and lasers just once, you rather recklessly decide to relive the battle via the Real Virtuality Combat Simulation Experiencinator. For some reason, your foe's combat prowess has been increased exponentially, though it does provide an opportunity to hone your skills, and your pride as a warrior compels you to take up the gauntlet.In-game description
There are two different strategies that players use in Duty Finder: 2-2-2-2 and 4-4, the former being more popular and generally used.
- : 2-2-2-2: Assign players to pair at cardinal positions. The pairs can be of any role, but keep in mind that it is better for melees to be paired with ranged. Most, if not all, will a pair a DPS with a tank/healer.
Emerald Weapon will start with Emerald Shot, a heavy-hitting tankbuster on the main tank (MT). Then it will follow up with a raidwide magical AoE Optimized Ultima. Pre-shield + regen on the MT, and pre-mitigate the party.
Aetheroplasm Production: Blue and yellow orbs will spawn at the edges of the arena, slowly moving to the center. Players will have to pop two orbs with their pairs. Be warned that you cannot pop the same colored orb twice.
As soon as you see the boss cast this ability, get ready to run to the edge of your cardinal spot to pop your orb. Come back to the middle for shields and heals, and rotate accordingly based on the color of the orbs. (Note: Everybody will rotate the same direction no matter what.)
Divide Et Impera: A red stack marker will be assigned to a tank. Both tanks can stack, or one tank can invuln it. Do not stack if you are not a tank.
The Primals' arrangement of Ultima plays during the first phase. The Black Wolf Stalks Again plays during the second phase.