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How to unlock Castrum Fluminis
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Tsukuyomi Fighting Game
Castrum Fluminis is experimental grade 70. Final Fantasy 14Added in Patch 4.3 Under the Moon After Tsuyu was forced to mercilessly relive her past and regain her memories as Yotsuyu, and thanks to Asahi's aether-infused crystal, Yotsuyu transformed into the night god Tsukuyomi.

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As Hien pursues Asahi, it's up to you to stop Tsukuyomi before she plunges Doma into eternal night. Below, we'll take a look at everything you need to know about the experiment. Including how to deal with Tsukuyomi's mechanics in each phase of the battle.
How to unlock Castrum Fluminis
Castrum Fluminis is unlocked through main story missions. 'Main Agreement' during Mission set patch 4.3– This experiment has Entry level requirements 335 to join
Tsukuyomi Fighting Game
Phase 1
In the first phase, Tsukuyomi uses the following attacks and mechanics.
Attack name |
|
details |
---|---|---|
torture to death |
Tank Buster |
Deals high damage in The cone goes in front of the boss.Aiming at Tsukuyomi's main target, the tank should Confront the boss away from the rest of the party. while using Defense Cooldown To reduce the damage from this attack |
Zashiki-Asobi |
AoE |
Tsukuyomi will call fans. Go around the arena One in the centerThen it is a set of Six rings form a circle around the edge of the field.– Then these fans will Explosive in AoE rangeStarting from the middle fan and Proceed in the order in which they were summoned.– See where the first AoE appears and move to Safe spot next to until the middle fan explodesThen step into the center to avoid the rest. Once the fans decide, Tsukuyomi will cast the actors. Evening– |
Evening |
special |
Randomly unlocked. Steel of the Underworld– defect– midnight fogor Leader of the Underworld– Tsukuyomi will use this attack. During the Zashiki-Asobi periodAs fans explode |
Steel of the Underworld |
Conal AOE |
Cause damage in A large cone reaches the boss's face.– Move away from the AoE indicator to avoid damage. |
defect |
AoE throughout the room |
Deals damage to all party members. Restores with AoE healing. |
midnight fog |
call |
Tsukuyomi will summon two people. Midnight mist on the other side of the stage to be linked together slowly moving towards each other– If the clouds touch each other They will explode. Deals damage to all party members. Destroy both clouds Before this happens |
Leader of the Underworld |
line stack mark |
Target random players with Stack Marker Gather together according to their position. to spread the damage of this AoE |
Tsukuyomi will also end this phase. Night BloomCauses damage to both parties causing it. Go down and count. for a moment to prevent you from taking any action.
Phase 2
When you can move again Several additions will appear and target Tsukuyomi. When increasing attack They will fill Tsukuyomi's Suffering ScaleThis indicates how much damage her phase-ending attack deals later.
Grouped up and Defeat each wave of boost to protect Tsukuyomi.– in the end. Monster of xenos will pop up and throw concentrationDeals damage to the party and applies Stun and Down for the Count when you are able to attack. Defeat Zenos' Specter to end the phase.–
Tsukuyomi will play the role. Night Bloom again, Deals damage based on her suffering gauge.– If the gauge was at 100 it would look like this. Kill everyone instantlyTherefore, you will need to go through the boost phase before this can happen. After Nightbloom, the third phase will begin.
Phase 3
During this period Tsukuyomi will use multiple attacks from a certain distance. Including a couple of new attacks. which are detailed below
Attack name |
|
details |
---|---|---|
tranquility |
special |
Divide the arena into half white and a half black– Standing in the white half will gradually accumulate a pile. moonlightWhile standing in the black half will accumulate stacks of moon shadow– If one of the debuffs is reached 5 pilesYou will suffer from Doom and bleeding– Moving to the other half of the arena will begin removing stacks of your opponent's debuffs.– To avoid getting hit by Doom, you'll have to do it from time to time. Switch between both parts of the stage.– |
moonlight – lunar rays |
AoE ring |
two Moonlight Orb They appear on either side of the stage. These things will be thrown. lunar raysCause damage in Large ring AoE too Safe spot near the orb itself, switch to the other side of the arena to deal the Moonlight or Moonshadow debuff. Then stand near the orb to avoid the Lunar Halo. |
anti twilight |
AoE throughout the room |
Deals damage to all party members and Bring the stage back to normal.– |
dance of death |
AoE throughout the room |
Deals damage to all players. Then prepare to cast. Madness– |
Madness |
continuous stack mark |
Also target one player. Continuous stack of markers– Group affected players and Remained there for the duration of the attack. to spread out the damage Healers should Heal through this attack. To make everyone healthy |
Dark Sword/Light Sword |
Conal AOE |
Cause damage in Large AoE cone– Move to the opposite side to avoid AoE. |
Tsukuyomi will use Evening Throughout this period, if twilight occurs Leader of the UnderworldThe target player should try. Standing on the boundary between the two halves of the stage so that everyone can Group for Stack Marker While still being able to switch sides if needed.
This third phase mechanic is repeated until Tsukuyomi is defeated. Pay close attention to you moonlight and moon shadow Debuff and move as necessary to avoid. Doom– A moon will appear above your head during this mechanic which will replenish as your stack increases. Use this to keep an eye on your debuff.

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