The Moon Phase System or lunar phase (月齢, getsurei)? is a component of a vast majority of Megami Tensei games. The various phases of the moon often affect battle, negotiation and fusion, and often affects other aspects of the game as well. The moon phase often functions as a counter for item and spell effects, such as a spell lasting until the next new moon. Regardless of what variation the system takes, the cycle of the moon phase is always as follows:

First quarter Last quarter
Waxing crescent Waxing gibbous Waning gibbous Waning crescent


0
(New)
1 2 3 4
(Half)
5 6 7 8
(Full)
7 6 5 4
(Half)
3 2 1

recycle

In most offline installments, the phase changes depending on how many steps the player has moved the character in the dungeon or large map, if movement is not menu-based. Moon phase changes automatically following the in-game clock in Shin Megami Tensei NINE and Shin Megami Tensei IMAGINE. In Persona 3, it simply follows the real world calendar and the phase changes day by day.

Appearances[edit | edit source]

Role[edit | edit source]

Shin Megami Tensei II[edit | edit source]

Demons will gain or lose power depending on the phase of the moon and their specific moon affinity type, based on the following chart, where "8" is half damage, "16" is normal damage and "32" is double damage:

Type New 1/8 2/8 3/8 Half 5/8 6/8 7/8 Full
A 16
B 12 18 16 14 16 18 20
C 10 18 16 14 12 16 20 22
D 9 20 16 15 11 14 16 20 24
E 19 18 17 16 14 12 10
F 8 18 12 16 14 18 24 28 32
G 26 20 16 12 8 12 16 20 26
H 14 15 16 18 14 16 18 20
I 20 12 18 14 16 14 20 12 22
J 26 20 18 16 22 16 14 12 8
K 14 17 16 14 16 18
L 24 20 16 12 10 12 16 20 24

The moon phase affects demons' power in Shin Megami Tensei and Shin Megami Tensei: if... as well, however charts for how moon phases affect each phase affinity type are unavailable at this time.

Shin Megami Tensei IMAGINE[edit | edit source]

While moon phases do not have any effect on negotiation or fusion, they do change various elements of the in-game world. Shops will change their merchandise at certain moon phases, offering unique cards, weapons, compendium memories and consumables.

During the New Moon period, Inviolable variations of Divine demons will spawn in Shinagawa. Killing a large number of them will spawn a Dominion field boss. This period also changes two of the Shinagawa-based dungeons to feature a large amount of Haunt demons and a different boss entirely. Hresvelgr is replaced by Nidhoggr. Norn is replaced by Nyx. A field boss variant of Daisoujou can also be spawned by law alignment players in Kuchinawa Caverns.

During the Full Moon period, synthesis success rate and cultivation expertise gain are increased. It is also possible to fight the field boss Nyarlathotep during this period.

Shin Megami Tensei IV Apocalypse[edit | edit source]

The Moon Phase changes as the story progresses, eventually reaching a Full and Misoka Moon at its climax on the Peace/Anarchy routes. It is merely cosmetic and does not affect game mechanics in any way.

Megami Ibunroku Persona[edit | edit source]

Moon phases do not affect demon conversation, and seem to serve little purpose except that Unknown Powers can only be obtained by fusing Personas under specific moon phases, primarily the New Moon.

Persona 3[edit | edit source]

The moon phases play similar roles as in other Megaten games, except that the moon phase is determined by days of the month as opposed to footsteps. Every time the full moon appears, it signals the appearance of a strong Shadow.

Certain abilities receive a damage boost during certain moon phases.

Digital Devil Saga: Avatar Tuner 2[edit | edit source]

The team has a chance of entering Berserk Mode during 7/8 or 8/8 phases, although there is a piece of equipment, the Berserk Ring, which allows the team to enter Berserk Mode regardless of solar phase except for compulsory battles.

Variations[edit | edit source]

Shin Megami Tensei III: Nocturne[edit | edit source]

The moon no longer exists. Instead, the phases of Kagutsuchi play almost the same role the moon did before. Full Kagutsuchi results in maddened, crazed demons which do not think rationally. New Kagutsuchi results in quiet, subdued demons. Several fusion results are dependent on Kagutsuchi's phase, and the game's unique sacrificial fusion system requires a Full Kagutsuchi phase. There are also conversation skills that involve the Kagutsuchi phases to improve enemy responses.

Several puzzles and locations in the game require the use of the Kagutsuchi phase, as well.

Shin Megami Tensei: Strange Journey[edit | edit source]

The Schwarzwelt's moon serves as the Moon Phase System. Fusions are more likely to fail in full moons, demons act irrationally and relax their inhibitions allowing for recruitment of demons of the dark alignment if the SubApp Lunatic is installed, and certain attacks work better on certain phases.

  • In Horologium, a specific teleportation point will only work properly if the moon is full.

Persona 4[edit | edit source]

Weather takes the place of the moon phases, with different weather creating a different effect. Important events will occur during foggy days. The effects of the moon phase on fusion are effectively replaced by the Fusion Forecast system.

Digital Devil Saga: Avatar Tuner[edit | edit source]

The moon phases are replaced with the "Solar Noise", which has the same basic function as the moon phases. If any of the characters have a status ailment such as silence or poison and the solar noise is minimum, those status will be healed. Cells will be sold at a maximum price at Maximum Solar Noise and will be sold at their lowest at Minimum Solar Noise, with the single exception of the Jack Cell, which is exactly the opposite.


Franchise-wide
Demon - Magic (Fusion Spell) - Battle Stats - Damage - Experience - Level - Element - Extra Skills - Critical - Status effects - Macca - Yen - Magnetite - Incense - Alignment - Moon Phase System - Demon Summoning Program (COMP) - Cathedral of Shadows (Fusion - Skill Inheritance - Accidents / Special / Three-demon / Sacrificial / Sword) - Demonic Compendium - Evolution - Special conversation - Rag's Jewelry - Code Breaker - Turn Press - New Game Plus - Ultimate Boss - Streetpass - Password - Difficulty
Shin Megami Tensei series
Terminal - Guardian (if...) - RTS (NINE) - Magatama (3) - Reason (3) - EX Missions (SJ) - Challenge Quest (4) - Whisper event (4) - Smirk (4) - Barrier (4) - Partners (4A)
Devil Summoner series
Loyalty - Personality - Mystic Change - Nemechi (SH) - Case Files (RKKA)
Majin Tensei series
Rank - Affinity (2) - Arcana (Ronde)
Persona series
Shadows / Personas (Initial / Prime / Ultimate / Ancestor / Reverse / Sub) - Skill Card - Totem (1) - Type/Subtype (1+2) - Affinity (1+2) - Rank (1+2) - Mystic Change (1+2+5) - One More (3-5) - Growth Rate (1+2) - Unknown Power (1+EP) - Personality (1+2, 5) - Material Card (2) - Mutation (2) - All-Out Attack (Cut-in) - Heart Item (3) - Shuffle Time (3+4) - Daily Life (3-5) - Calendar (3-5) - Social Stats (3-5) - Social Link (3+4) - Tactics (3-5) - Requests (3-5;Q+Q2) - Arcana Chance (4) - Forecasts (Fusion / Weather) (4+5) - Guard (3P+4+5) - Boost (Q+Q2) - Power Spot (Q+Q2) - F.O.E (Q+Q2) - Confidant (5) - Technical (5) Treasure Demon (5) - Party Switch (5) - Disaster Shadow (5R) - Fusion alarm (5R) - Persona Traits (5R) - Third Eye (5)
Devil Children series
Trainer - Bank - BattleNet - Relic Fusion - Power Fusion - Powers
Digital Devil Saga series
Berserk Mode (2)
Devil Survivor series
Devil Auction - Extra Turn Battle - Skill Crack - Titles (DSO / DS2 / RB) - Fate System (2) - Add-On (2)
Other
Equip Type (GMT:TM) - Class Change (TMS♯FE) - Topic System (TMS♯FE) - Side Quests (TMS♯FE) - Ad-lib Performance (TMS♯FE) - Session (TMS♯FE) - Dual Arts (TMS♯FE)
Megami Tensei Megami Tensei (Telenet) - Megami Tensei (Atlus) - II - Kyūyaku
Shin Megami Tensei Shin Megami Tensei - II / Gaiden: Ma To Houkai - if... / Hazama's Chapter - J - NINE -
III: Nocturne / Pachislot - 20XX / Devil's Colosseum - IMAGINE - Tokyo Requiem - Strange Journey (Redux) - Devil Hunter Zero - IV / Apocalypse - Devil Collection - Synchronicity Prologue - Liberation Dx2 - V
Last Bible Last Bible - II - Another Bible - III - Special -
New Testament / II: Hajimari no Fukuin / III: Mugen no Eiyuu
Majin Tensei Majin Tensei - II: Spiral Nemesis - Ronde - Blind Thinker / II
Devil Summoner Devil Summoner / Pinball: Judgment - Soul Hackers / Intruder / Soul Hackers New Generation -
Raidou Kuzunoha vs. The Soulless Army - Raidou Kuzunoha vs. King Abaddon
Persona Megami Ibunroku Persona (PSP Remake) / Ikū no Tō Hen -
2: Innocent Sin / Eternal Punishment / Lost Memories / Infinity Mask -
3 (FES* / Portable*) / Dancing in Moonlight
4 (Golden*) / Arena / Ultimax / Dancing All Night
5 (Royal*) / Dancing in Starlight / Scramble: The Phantom Strikers
Q: Shadow of the Labryinth - Q2: New Cinema Labyrinth
Devil Children Black Book / Red Book - White Book - DemiKids Light / Dark - Fire Book / Ice Book -
Messiah Riser - Puzzle de Call! - Appli de Call! - Devil Children Mobile
Digital Devil Saga Avatar Tuner - 2 - A's TEST Server
Devil Survivor Devil Survivor (Overclocked) - 2 (Record Breaker) / The Extra World
Jack Series Jack Bros. - Demonic Help Party
Other games Giten Megami Tensei: Tokyo Mokushiroku - Card Summoner - Tokyo Mirage Sessions ♯FE - Maken X - Catherine / Full Body
Digital Devil Story (Novels) Digital Devil Story: Megami Tensei - 2: Warrior of the Demon City - 3: Demise of the Reincarnation
New Digital Devil Story New Digital Devil Story: Goddess of Enchainment - 2: Queen of the Ice Fields - 3: Planet of the Devil - 4: Wrath of the Young Emperor - 5: Eternal Goddess - 6: Bonds of Reincarnation
Other Novels Devil Summoner: Kuzunoha Raidou tai Shibito Ekishi - Giten Megami Tensei: Distant Flow ~EXILE~ - Megami Ibunroku Persona: Shadow Maze - Persona 3: Shadow Cry / Owari no Kakera / Alternative Heart / Velvet Blue - Persona x Detective Naoto - Quantum Devil Saga: Avatar Tuner - Devil Survivor 2 The Animation: Cetus's Prequel
Anime Digital Devil Story: Megami Tensei - Tokyo Revelation - Persona -trinity soul- - Persona 3 The Movie - Persona 4 The Animation / -The Factor of Hope- / The Golden Animation - Persona 5 The Animation The Day Breakers - Persona 5 The Animation - DeviChil - Devil Children: Light & Dark - Devil Survivor 2 The Animation
Manga Shin Megami Tensei: Tokyo Revelation - if... / Kahn - IV: DEMONIC GENE / -Prayers- - Gaiten: Hato no Senki - EDEN - CG Senki: Dante no Mon - Majin Tensei - Devil Summoner: Raidou Kuzunoha vs. The Lone Marebito - Megami Ibunroku Persona - Persona: Tsumi to Batsu - Persona 3 - Persona 4 / Arena - Persona Q: -Roundabout- - Persona 5 - Persona Q2: Roundabout Special - Devil Children / Light & Dark - Digital Devil Saga: Avatar Tuner: Shinen no Matou - Devil Survivor - 2: -Show Your Free Will- / The Animation Manga
Mobile Apps The Night Before - QIX - Chaining Soul - Aegis: The First Mission - Em - Illust Puzzle - Escape - Social - Ain Soph - Mobile Online - The Card Battle - Colors - Persona O.A. - Mobile Phone Demon Collection - Atlus Casino - Devil Summoning Program - Digital Novel
Other The Amala Multiverse - Earth - Expanse - Great Will - Protagonists - In popular culture
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