A list of endings in Mizuki & Caerula Arbor.
| Precious Days
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| In the end, the goal envisioned from the very beginning is brought to fruition, and the two creatures, from Seaborn to human, are ready to usher in a new tomorrow after a full meal. Everyday life is the greatest joy that fate bestows upon the living, and indeed, peaceful days are the most joyous of all.
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| Condition
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| Simply clear the 5F Dreadful Foe, Curse of Cognition.
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| Age of the Silence
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| In silence the terrible waves rise, and within it disappears the knight's howl. The calamity that once destroyed Iberia surges again, and this time it shall not recede.
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| Condition
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Complete a run with the Precious Days ending and do the following steps in a single run:
- Obtain
 Breath of the Tide from Encounter: Delusions of Lunacy at the cost of 2  Hope or 1 die roll. This will cause the Tide-Hunt Knight to appear on all operations up until and including 4F, and changes the 5F Dreadful Foe from Curse of Cognition to "Fate's Favored Child".
- If the Tide-Hunt Knight is defeated at any point before the player enters 5F, they will receive
 Regressed Rocinante which reverts the 5F Dreadful Foe to Curse of Cognition, and the Age of the Silence ending will be lost for the run.
- Clear "Fate's Favored Child".
- Optional: Before entering "Fate's Favored Child", obtain
 The Knight's Corpus from Encounter: The Knight Persists. This will reduce The Last Knight's DEF to 800, making the Dreadful Foe much less difficult. However, take caution that the Tide-Hunt Knight's DEF will be reduced to 200 as well.
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| Price of Peace
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| The conflict over the "Firstborn" comes to an end, and the human Him triumphs over the inhuman Him. The Silence fades, the tides retreat, and the being known as Mizuki shall never again return to the land.
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| Condition
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Complete a run with the Age of the Silence ending and do the following steps in a single run:
- Obtain
 Bishop's Research from Encounter: The Beginning.
- Obtain
 Caerula Animus from the namesake Encounter by choosing "Search the garden". This will cause the player to enter 6F floor instead of ending the run upon clearing 5F with Destiny of We Many as the Dreadful Foe.
- NOTE: The Bishop's Research will cause the player to lose 5 Light after clearing operations and the Caerula Animus will cause the player to lose 50 Light and a random Operator to suffer from Rejection when obtained, making things more difficult. However, the latter also allows the player to enter the "Paean" Encounter and obtain
 "Last Refrain" which applies two random Enlightenments to offset that.
- Clear Destiny of We Many.
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| Stella Caerula
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| The descendants of evolution rise from Terra's tides, break through the skies, and fly towards the endless sea of stars. There is no more pain, no more suffering, only the joy of a new life.
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| Condition
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Complete a run after Caerula Arbor's Expansion II and do the following steps in a single run:
- Obtain
 Caerula Memory from Encounter: The Beginning.
- NOTE: The Caerula Memory cause the player to lose 100 Light and a random Operator to suffer from Rejection, making things much more difficult.
- Optional: In Encounter: Caerula Ritual (only appears while having Caerula Memory), the player can choose to either gain 30 Light or obtain
 Caerula Arbor which causes the player to gain 15 Light whenever an operation is cleared without losing Life Points but increases enemies' ASPD by 15.
- Obtain
 "Determination",  "Vigil", or  "Hesitation" from Encounter: Sublimation. Having any of the aforementioned Collectibles will cause the player to enter 6F instead of ending the run upon clearing 5F with Glory of Humanity as the Dreadful Foe.
- The options to take "Determination" and "Vigil" will only appear when the player has at least 90 and between 50 to 89 Light upon entering the Encounter, respectively, otherwise the player will be forced to obtain "Hesitation". As such, it is highly recommended to prioritize regaining Light before entering Encounter: Sublimation.
- Clear Glory of Humanity.
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