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How to unlock Castrum Fluminis
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Tsukuyomi struggle march
Castrum Fluminis is level 70 experimental Final Fantasy 14added in patch 4.3, Under the Moonlight. After Tsuyu is brutally forced to relive his past and regain his memories as Yotsuyo, and with Asahi's supply of ether crystals, Yotsuyo transforms into the deity of the night, Tsukuyomi.

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With Hin chasing Asahi, it's your job to stop Tsukuyomi before she plunges Douma into an eternal night. Below, we'll take a look at everything you need to know about the Trial, including how to deal with each of Tsukuyomi's mechanics at each stage of the fight.
How to unlock Castrum Fluminis
Castrum Fluminis will be unlocked through the Main Scenario Quest “initial agreement” during Patch 4.3 questline. This test has a Required level 335 to participate
Tsukuyomi struggle march
Phase 1
Tsukuyomi will use the following attacks and mechanics in the first stage.
Name of the attack |
Type |
Details |
---|---|---|
torment to death |
Tankbuster |
It does a lot of damage in A Cone in front of bosstargets Tsukuyomi's main target. tank should Face the boss away from the rest of the party During use Defense cooling To reduce the damage of this attack. |
Zashiki-Asoubi |
AoEs |
Tsukuyomi will summon fans around the arena. One in the centerthen a series of Six in a circle that surrounds the edge of the field. Then, these fans will do it Explode in an AoEstarting with the central fan and They continued in the order of their summons. Look where the first AoE appears move to Safe spot next to it until the central fan explodesthen enter the center to avoid the others. Tsukuyomi will choose the cast as the fans decide it was night. |
it was night |
special |
Randomly cast Steel of the underworld, rebuke, midnight fogor The leader of the underworld. Tsukuyomi will use this attack During Zashiki-Asobiwhile the fans explode. |
Steel of the underworld |
Conal AoE |
It causes damage in a Big cone in front of the boss. Move out of the AoE marker to avoid taking damage. |
rebuke |
AoE across the room |
Damages all party members. Heal with AoE heals. |
midnight fog |
to summon |
Tsukuyomi will summon two people Midnight fog clouds At opposite ends of the field that connect, They move slowly towards each other. If the clouds are touched, they explode, damaging all party members. Destroy both clouds Before that happens |
The leader of the underworld |
Line stack indicator |
Targets a random player with a stack marker. Group by your location To spread the damage of this AoE. |
Tsukoyomi this stage with Blooming nightcausing damage to the whole party, which causes Down for the count For a few seconds, it prevents you from taking action.
Phase 2
When you can move again, several additions will appear and target Tsukuyomi. As adds attack, they fill up Tsukuyomi Range Gaugewhich shows how much damage his end-of-phase attack will deal later.
Grouping and Destroy every wave to protect Tsukuyomi. Finally, Specter of Zenos Will appear and cast focusdamaging the party and causing Stun and Down for count. When you can attack, Defeat Zeno's Specter to end the phase.
Tsukuyomi will act Blooming night again, According to his range meter, he deals damage. If the gauge is at 100, it will Kill them all immediatelyso you have to go through the add step before that happens. After Nightbloom, the third phase will begin.
Phase 3
At this point, Tsukuyomi will use several attacks from phase one, as well as a few new ones, which are detailed below.
Name of the attack |
Type |
Details |
---|---|---|
celenomancy |
special |
It divides the arena into one half white and A half black. Standing in the white half slowly accumulates stacks of it moonlightwhile standing in the black half of the pile is piled up shadow of the moon. If one of the debuffs arrives 5 stackswill be imposed on you Doom and bleed out. Moving to the opposite half of the field begins to remove the opponent's debuff stacks. Sometimes you have to do this to prevent Doom from being imposed Switch between both halves of the field. |
Moonlight – lunar aura |
Ring AoEs |
two Moonlight spheres will appear, one on either side of the arena. These are then poured lunar halocausing damage in a AoE large circle with a Safe spot near the orb Go to the other side of the field yourself to manage your Moonlight or Moonlight, then stand near the orb to avoid the Moon Halo. |
anti-twilight |
AoE across the room |
Damages all party members and It returns the arena to normal. |
dance of the dead |
AoE across the room |
Deals damage to all players, then prepares to cast madness. |
madness |
Contiguous stack pointer |
Targets a player with a Contiguous stack pointer. Grouping on the injured player and Stay there for the duration of the attack to spread its damage. Healers must recover through this attack So that everyone is healthy |
Dark blade / Light blade |
Conal AoE |
It causes damage in a Large cone AoE. Move to the opposite side to avoid AoE. |
Tsukuyomi will use it was night Throughout this phase if the night begins The leader of the underworldthe target player must try Stand on the border between both halves of the field so that everyone can Group for Stack Marker While you can still switch sides if needed.
These mechanics of phase three will be repeated until Tsukoyomi's defeat. Take good care of yourself moonlight and shadow of the moon debuffs and move if necessary to avoid Doom. During this mechanic, a moon also appears above your head, which fills up as your stacks increase. Use this to keep an eye on your debuffs.

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