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In Shin Megami Tensei II, the moon phase affects how much damage demons deal along with negotiation. The exact multiplier for each phase differs depending on the demon, and many demons are not affected by the moon phases at all (type 0). There are 15 moon phase types.[2]
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In Shin Megami Tensei II, the moon phase affects how much damage demons deal. The exact multiplier for each phase differs depending on the demon, and many demons are not affected by the moon phases at all (type A). There are 12 different moon phase types.[3]
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In Shin Megami Tensei if..., the moon phase affects how much damage demons deal. The exact multiplier for each phase differs depending on the demon, and many demons are not affected by the moon phases at all (type A). There are 14 different moon phase types.[4]
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In Nocturne, moon phases are called "Kagutsuchi" phases and are connected to the titular force in the story but function the same way. The phases determine what is found in chests. There are abilities such as "Bright Might" that guarantee a critical hit on certain phases. Kagutsuchi phases also influence demon negotiation: when the moon is full, demons are addled by the power of Kagutsuchi and are unable to talk.
Certain demons, such as the Fiends, can only be fused during certain Kagutsuchi phases.
In Apocalypse, the moon phases serve as a countdown until the Divine Powers' plan to create the Cosmic Egg through Shesha and form a new universe is fulfilled, starting from a new moon and going to the next full moon. Unlike in other games, it does not affect gameplay like negotiation.
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In Devil Summoner, the moon phase affects how much damage demons deal. The exact multiplier for each phase differs depending on the demon, and many demons are not affected by the moon phases at all (type I). There are 15 different moon phase types,[5] the first two of which (types A and B) are unused.
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Moon Phases change day by day and affect major story events. At a full moon the party goes through a scripted event against a shadow representing one of the arcana. After the full moon is over a new set of floors in Tartarus became available. If S.E.E.S. clears those floors they eventually hit a magical barrier that prevents further passage. This barrier only goes away on the next full moon.
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The Digital Devil Saga games rename the moon phase system the "Solar Noise" system but it works similarly. Various skills rely on the specific phase. The phases impact which items you find in chests. Solar Noise phase affects how much you can sell items for, Max Noise raises prices highest while min is lowest, with the exception of the "Jack Cell" item which is the opposite.
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This game introduces Berserk Mode which activates at the full solar noise phase. In this form the characters are only half demon and feel intense hunger and viciousness. They can only use physical or hunt skills. Attacks are far stronger, pierce all phys resistances and have a very high critical rate but defense is significantly weaker so the characters are also more vulnerable. Accuracy is also much lower. Berserk mode nets much higher experience and Atma points.