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The Moon Phase system is a recurring game mechanic in the Megami Tensei franchise.

The Moon Phase in Shin Megami Tensei V's UI.

Mechanics

Digital Devil Story: Megami Tensei series

Digital Devil Story: Megami Tensei

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Along with alignment and race, moon phase is a factor in the success of demon negotiation.[1]

Digital Devil Story: Megami Tensei II

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Shin Megami Tensei series

Shin Megami Tensei

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In Shin Megami Tensei, the moon phase affects how much damage demons deal along with negotiation; demons will refuse to negotiate on a full moon. The exact damage 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]

Description
0 Moon phases do not affect this demon.
1 This demon is stronger at a full moon.
2
3
4
5 This demon is stronger at a new moon.
6
7
8
9 This demon is stronger at a full moon.
10
11
12 This demon is stronger at a new moon.
13
14

Shin Megami Tensei II

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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]

New 1/8 2/8 3/8 Half 5/8 6/8 7/8 Full
A 100% 100% 100% 100% 100% 100% 100% 100% 100%
B 75% 112.5% 100% 100% 87.5% 100% 100% 112.5% 125%
C 62.5% 112.5% 100% 87.5% 75% 100% 100% 125% 137.5%
D 56.25% 125% 100% 93.75% 68.75% 87.5% 100% 125% 150%
E 118.75% 112.5% 106.25% 100% 100% 100% 87.5% 75% 62.5%
F 50% 112.5% 75% 100% 87.5% 112.5% 150% 175% 200%
G 162.5% 125% 100% 75% 50% 75% 100% 125% 162.5%
H 87.5% 93.75% 100% 100% 112.5% 87.5% 100% 112.5% 125%
I 125% 75% 112.5% 87.5% 100% 87.5% 125% 75% 137.5%
J 162.5% 125% 112.5% 100% 137.5% 100% 87.5% 75% 50%
K 87.5% 106.25% 100% 100% 87.5% 100% 100% 100% 112.5%
L 150% 125% 100% 75% 62.5% 75% 100% 125% 150%

Shin Megami Tensei if...

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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]

New 1/8 2/8 3/8 Half 5/8 6/8 7/8 Full
A 100% 100% 100% 100% 100% 100% 100% 100% 100%
B 68.75% 112.5% 100% 100% 87.5% 100% 106.25% 118.75% 125%
C 56.25% 118.75% 100% 87.5% 75% 100% 100% 125% 143.75%
D 50% 125% 100% 100% 68.75% 81.25% 100% 125% 156.25%
E 125% 112.5% 106.25% 100% 100% 100% 87.5% 75% 62.5%
F 43.75% 50% 112.5% 100% 62.5% 112.5% 150% 175% 225%
G 162.5% 125% 100% 75% 50% 75% 100% 125% 162.5%
H 87.5% 93.75% 100% 100% 112.5% 87.5% 100% 112.5% 125%
I 125% 75% 112.5% 100% 100% 100% 125% 75% 137.5%
J 162.5% 125% 100% 100% 137.5% 100% 87.5% 75% 50%
K 87.5% 106.25% 100% 100% 87.5% 100% 100% 112.5% 100%
L 150% 125% 100% 100% 62.5% 75% 100% 125% 150%
M 37.5% 50% 62.5% 87.5% 100% 112.5% 125% 162.5% 225%
N 187.5% 137.5% 100% 87.5% 50% 87.5% 100% 137.5% 187.5%

Shin Megami Tensei: Nine

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Shin Megami Tensei III: Nocturne

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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.

Shin Megami Tensei: Imagine

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Shin Megami Tensei: Strange Journey

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Shin Megami Tensei IV: Apocalypse

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.

Shin Megami Tensei V

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Last Bible series

Last Bible Special

In Last Bible Special, the moon phase affects whether or not a Beast can negotiate, as well as the strength of the skill Moonlight. The phase can be inverted using the skill Muntenhan. The moon phase changes every 16 steps and resets to a new moon every 255 steps.

Moon Phases in Last Bible Special
Phase                                
Steps 0 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240

Devil Summoner series

Shin Megami Tensei: Devil Summoner

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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. These lettered designations are from the PSP guidebook; the Saturn version's Official Guidebook Final uses numbered designations and they are ordered differently.

New 1/8 2/8 3/8 Half 5/8 6/8 7/8 Full
AUnused 200% 175% 150% 125% 100% 75% 50% 25% 6.25%
BUnused 400% 100% 100% 100% 100% 12.5% 12.5% 12.5% 12.5%
C12 in Official Guidebook Final 250% 100% 100% 100% 100% 25% 25% 25% 25%
D11 in Official Guidebook Final 200% 100% 100% 100% 100% 50% 50% 50% 50%
E10 in Official Guidebook Final 150% 137.5% 125% 112.5% 100% 87.5% 75% 62.5% 50%
F8 in Official Guidebook Final 6.25% 12.5% 25% 37.5% 50% 62.5% 75% 87.5% 100%
G9 in Official Guidebook Final 100% 87.5% 75% 62.5% 50% 62.5% 75% 87.5% 100%
H 6.25% 100% 100% 100% 100% 100% 100% 100% 100%
I1 in Official Guidebook Final 100% 100% 100% 100% 100% 100% 100% 100% 100%
J2 in Official Guidebook Final 50% 62.5% 75% 87.5% 100% 112.5% 125% 137.5% 150%
K3 in Official Guidebook Final 50% 50% 50% 50% 100% 100% 100% 100% 200%
L4 in Official Guidebook Final 6.25% 25% 50% 75% 100% 125% 150% 175% 200%
M5 in Official Guidebook Final 25% 25% 25% 25% 100% 100% 100% 100% 250%
N6 in Official Guidebook Final 12.5% 12.5% 12.5% 12.5% 100% 100% 100% 100% 300%
O7 in Official Guidebook Final 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 6.25% 400%

Devil Summoner: Soul Hackers

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In Soul Hackers, 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 1). There are 13 different moon phase types.

New 1/8 2/8 3/8 Half 5/8 6/8 7/8 Full
1 100% 100% 100% 100% 100% 100% 100% 100% 100%
2 50% 50% 100% 100% 100% 100% 100% 150% 150%
3 50% 62.5% 75% 87.5% 100% 112.5% 125% 137.5% 150%
4 50% 75% 100% 100% 100% 100% 100% 125% 150%
5 25% 100% 100% 100% 100% 100% 100% 100% 200%
6 6.25% 12.5% 25% 37.5% 50% 62.5% 75% 87.5% 100%
7 100% 100% 100% 100% 100% 100% 100% 100% 200%
8 12.5% 12.5% 12.5% 12.5% 12.5% 12.5% 12.5% 12.5% 400%
9 150% 137.5% 125% 112.5% 100% 87.5% 75% 62.5% 50%
10 150% 125% 100% 100% 100% 100% 100% 75% 50%
11 200% 100% 100% 100% 100% 100% 100% 100% 100%
12 100% 100% 100% 200% 100% 100% 100% 100% 100%
13 6.25% 100% 100% 100% 100% 100% 100% 100% 100%

Soul Hackers 2

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Persona series

Megami Ibunroku Persona

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Persona 3

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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.

Digital Devil Saga series

Digital Devil Saga: Avatar Tuner

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The Digital Devil Saga games rename the moon phase system to 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.

Digital Devil Saga: Avatar Tuner 2

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This game introduces Berserk Mode which activates at the full solar noise phase.

References

  1. Digital Devil Story: Megami Tensei - Dungeon Crawlers. Archived: Dungeon Crawlers DDS Archive Wayback Machine. Retrieved December 16, 2023. dungeoncrawlers.org.
  2. 第三避難所/悪魔データ - 真・女神転生. Published December 12, 2018. Retrieved January 8, 2024. atwiki.
  3. 第三避難所/月齢影響 - 真・女神転生Ⅱ. Published February 2, 2019. Retrieved January 8, 2024. atwiki.
  4. SFC/悪魔/月齢影響 - 真・女神転生if. Published July 6, 2019. Retrieved January 8, 2024. atwiki.
  5. 第三避難所/月齢の影響 - 真・女神転生 デビルサマナー. Published April 21, 2019. Retrieved January 8, 2024. atwiki.