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|File:SMT_fusion_chart.jpg|Fusion chart from ''Shin Megami Tensei''
 
|File:SMT_fusion_chart.jpg|Fusion chart from ''Shin Megami Tensei''
 
|File:Fusion_Chart.png|Fusion chart from ''Majin Tensei II: Spiral Nemesis''
 
|File:Fusion_Chart.png|Fusion chart from ''Majin Tensei II: Spiral Nemesis''
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|File:P5 fusion chart.jpg|Fusion chart from ''Persona 5''
 
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Revision as of 17:45, 8 May 2017

"If you really want a certain demon, just try a shitload of combinations."
—Certain demons in Shin Megami Tensei III: Nocturne

Fusion, or Union (合体?), is the system in which two or more demons are combined together to create a new demon. A demon created via this system will inherit certain traits and abilities from the "ingredient" demons that were used to create it. The exact nature of this inheritance varies by the types of demons used in the fusion, by the type of demon being created by the fusion, by the phase of the moon (or its equivalent), and by other factors that vary by game.

The general rule for the most basic two-demon fusion is: a demon of race A fuses with a demon of race B, resulting in a demon of race C at level ((A's base level + B's base level) / 2). But there are many exceptions to this rule.

Some demons cannot be recruited or captured normally, and must instead be created via special fusion. Some of these demons can only be fused once certain prerequisites have been met; for example, some bosses can only be fused once they have been defeated.

In several games, demons can also be fused into weapons (usually swords), giving that gear new abilities based on the abilities of the demon used in the fusion.

Clarification

In Japanese titles, literal Fusion (フージョン?) when used, does not refer to traditional Devil Union. The word "Union" is more often used by Atlus Co., Ltd. when unambiguously rendering this concept in English.

Series-specific Rules

Megami Tensei series

In Megami Tensei games, gattai (合体?, lit. "union"), called fusion here, is possible at a Jakyou no Yakata (邪教の館?, lit. "mansion of the infernal master[s]")

Shin Megami Tensei series

In the main Shin Megami Tensei series, fusions are made at the Cathedral of Shadows. The first three installments of this series include three-demon fusion which gives player access to create more powerful demon than in two-demon fusion but with more complicated rules. Shin Megami Tensei: Nocturne has the unique sacrificial fusion mechanic, which is only carried out in a Full Kagutsuchi phase.

Shin Megami Tensei: Strange Journey

Fusion in this game is handled through the specialized Demon Fusion Program, which alongside the Demon Summoning Program is sent to the Schwarzwelt crew through a hacked AI, Verne, the brother AI to the crew's Arthur, from an unknown source by The Three Wise Men.

Jack's Squad also attempted to perfect Demon Fusion protocols without the intervention of the Three Wise Men, but their techniques were terribly flawed at best; this, coupled with their lack of the Demon Summoning Program and Demon Fusion Program meant they were forced to enslave demons rather than convince them to join them by negotiation, and that most of their higher level demons were mostly abominations such as Slimes, Pellaidhs, Pisacas, Ghouls, or Legions.

This would have severe implications for the story as their attempts to fuse demons and humans and abusing demon prisoners came into the fore.

Aside from that, the game also boasts a Special Fusion technique, which allows for the fusion of more than two demons into a single, more powerful one. However, the ingredients for these fusions are fixed and cannot be exchanged by similar substitutes.

Last Bible series

In the English-language localization of Last Bible (localized under the title Revelations: The Demon Slayer), fusion is referred to as Combination.

Rather than being performed at the Cathedral of Shadows, fusion in Last Bible is performed anyone on the world map using Kishe's Combine spell, and at shrines in Last Bible II.

Majin Tensei II: Spiral Nemesis

Known as REMIX, it can be done at REMIX Stations found at certain spots on the map, which typically requires doing a number of chapters before being able to reach it. The first appears in Slum Tokyo, and the chapter Shinjuku must be beaten before it can be accessed. It typically appears as a blue human head on the map. The person running the station is FRI-DAY, an artificial intelligence in the form of a head. Two to Three demons can be remixed, and multiples of the same demon can be used in a fusion if the player has one on each File. The more power races like Deity, Tyrant, Amatsu, etc. require being made through 3-Remix.

Two demons can also be fused on a mission by placing one of them on top of the other. However, it is advised that all equipment be removed from the demons. The equipment is lost after the fusion.

Devil Summoner series

In the Devil Summoner series, demons are fused by Victor at the Gouma-Den. In the Raidou Kuzunoha sub-series, demons can only be used in normal (non-sacrifice) fusion if they have maximum loyalty.

Persona series

In the Persona series, Personas can be fused in Igor's Velvet Room in the same manner that demons are fused in most other games.

In Megami Ibunroku Persona, when doing Manual Fusion, White Fusion is ordinary fusion, but Orange Fusion indicates a higher chance for Fusion accidents to occur, and Blue Fusion indicates the resulting Persona will receive +5 to its highest stat and +20 to Magic Attack; arrows indicate that a skill will be inherited: a horizontal arrow indicates the resulting Persona will inherit a skill from the first demon used in the fusion, while an angled arrow indicates the resulting persona will inherit a skill from the second demon, with an upward arrow granting +1 to all stats and a beneficial skill and a downward arrow granting -1 to all stats and an unfavorable skill.

In Persona 4 The Golden and Persona Q, the player now has control over which skills the fusion result inherits from its components.

Persona 3

Listed below is Igor's explanation regarding Fusion in Persona 3 FES.

Fusion Basics

"My role is to create new Personas...
By fusing your existing Personas together, I allow a new one to emerge.
When a new Persona is created, it tends to be of a higher level than the ones that were fused.
However, Personas that are fused are lost forever.
Since the process requires multiple Personas, you will be left with fewer than you had before...
Which powers will you forsake in order to gain new ones...? It is up to you to decide."

Fusion & S. Links

"Persona is the power of your soul, which thrives on the bonds you have with others.
Thus, it is only natural that Social Links affect the strength of your Personas.
If you have established a Social Link of the same Arcana as the Persona you wish to create...
...then that Persona will receive power from the Social Link and level up.
The amount of power it will receive depends on the level of the Social Link.
In some cases, your Persona may even surpass your own level. *chuckle*
Do you understand now how important Social Links are to Persona-users?"

Types of Fusion

"There are several types of fusion.
First, the Normal Spread... This is the most basic type.
You simply fuse two Personas together.
Next, the Triangle Spread...
In this type of fusion, three Personas are used to produce a Persona of an even higher order.
Supposedly, certain Personas can only be created through Triangle Spread fusion...
In general, Persona fusion exhibits predictable patterns dependent on the Arcana involved.
There are a number of combinations, however, that don't follow the usual patterns.
For example, fusing Personas of the same Arcana...
The best way to learn is to experiment on your own."

Skill Inheritance

"A persona created through fusion may inherit the skills possessed by its precursors.
In other words, it's possible to give a Persona skills that it could never learn on its own.
You should keep this in mind when you're trying to create a powerful Persona.
The mechanism of skill inheritance is not completely understood...
but there are three key points I'd like to share with you.
First, the skills to be inherited change every time you select a Persona for fusion.
Second, the chance of a skill being inherited depends on what the expected Persona is.
...I can give you more details on this some other time.
Lastly, the more skills the original Personas possess, the more skills the resulting Persona will inherit.
...Please remember this."

Inheritance Rules

"Allow me to explain more about skill inheritance.
For each Persona, there are skills that can be inherited, and those that cannot.
It is primarily determined by the Persona's characteristics...
Here are some general rules.
Personas proficient at physical attacks are unlikely to inherit magic attacks.
Regarding magic attacks... let us first discuss Fire, Ice, Electricity and Wind.
A Persona with an affinity for one of these four elements cannot inherit skills of the other three types.
Likewise, Personas with an affinity for Light will never inherit Dark skills, and vice versa.
Meanwhile, Personas proficient at healing cannot inherit any physical attacks.
As you'd expect, Personas good at physical attacks tend to be bad at magic, and very few Personas can wield magic of multiple elements.
Even more rare are Personas who can inherit any skill, although they do exist.
You will learn more, by and by, as you experiment with fusion."

Skill Cards (Portable only)

"Skill cards let you seal skills and teach them to any Persona.
For example, if you were to use an Agi' card on a Persona, that Persona would then learn 'Agi'.
Even if the skill is one that cannot be passed down through fusion, it seems Personas can learn via skill cards...
Also, if the Persona you wish to teach the skill to already has eight skills in its current repertoire...
You will be able to choose which skill to discard.
I've also heard that skill cards can be copied somewhere...
...It would be best for you to learn about that yourself through trial and error."

Incense Card

"Are you familiar with the Minor Arcana cards? They depict coins, swords, and whatnot.
Of those, the face cards--the Page, Knight, Queen and King--hold special powers.
They are called Incense Cards, and they can enhance Personas' abilities.
These cards' effects can be passed on through fusion to new Personas.
If you happen to acquire one, you should give it a try."

Fusion Accidents

"I regret to inform you of this, but our powers are not perfect.
Although rare, there are times when the cards are placed incorrectly...
...causing an accident.
The resulting Persona will most likely be different than what we anticipated.
Please pardon us if this does occur..."

Item Bearing

"Occasionally, a newly created Persona bears an item within.
I advise you to raise this Persona, as it will eventually produce a useful piece of equipment.
Please remember this."

DemiKids

All demons fused with the respective partner demon act as Mitamas. Rank UP fusion allows one to fuse two of the same demon together to increase it's HP and MP as well as awaken its dormant skills. Fusing Shiny demons this way with the same demon it's a shiny version of will also result in the Shiny demon increasing two stats, while Boss Type demons can increase their stats from anywhere between 1 to 4. Certain demons who are fused this way a number of times will Rank Up and become a new demon. Such as fusing multiple Cupids together will evolve them into Nikare.

Relic Fusion is a special fusion where you take fossils that can be bought in the game and fuse three of them together. This can result in either a zombie version of certain demons or a regular demon being born. No matter the order the demon will be the same. Resurrecting Zombie fusion will result in a zombie demon being brought back to life after its soul is fused with it.

Devil Survivor series

In all games of the series, demon fusion takes place using the Cathedral of Shadows Program (often termed cath.exe) that is introduced with the Demon Summoning Program. In all games to date, only two demons can be used for fusion. Unlike previous games in the entire Shin Megami Tensei series, the player has control over what skills the resultant demon inherits from its fusion components, and can even search what demons are required to produce the desired result. If the fusion components have increased stats (either from leveling up or prior fusions), the resultant demon can also inherit a portion of those stats (albeit distributed somewhat randomly).

See also

Gallery

 
Megami Tensei Fusion Chart
Fusion chart from Megami Tensei
 
Megami Tensei II Fusion Chart
Fusion chart from Megami Tensei II
 
SMT fusion chart
Fusion chart from Shin Megami Tensei
 
Fusion Chart
Fusion chart from Majin Tensei II: Spiral Nemesis
 
P5 fusion chart
Fusion chart from Persona 5
General
Dungeon - Combat - Turn - Action - Level - Experience - Party - Stats - Skills - Items - Equipment - Melee Attack - Ranged Attack - Damage (Fixed) - Guard - Escape - Accuracy - Critical - Multi-hit - Insta-Kill - Ailments - Drops - Encounter - Random Encounters - Symbol Encounters - Ambush - Difficulty
Franchise-wide
Demon - Magic (Fusion Spell) - Affinities - Unique skills - Extra Skills - 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 - Negotiation (Special conversation) - Rag's Jewelry - Code Breaker - Press Turn - New Game Plus - Ultimate boss - Streetpass - Password - Skill Mutation - Energy Drain - Party Talks
Shin Megami Tensei series
Terminal - Guardian (if...) - Tactical Battle (NINE) - Capacity (NINE) - RTS (NINE) - Reinforcements (NINE) - Race Shift (NINE) - Modules (NINE) - Magatama (3) - Reason (3) - Demon Co-Op (SJ) - EX Missions (SJ) - Challenge Quest (4) - Skill Potential (4/A-5) - Smirk (4) - Barrier (4) - Partners (4A) - Jade Dagger (4A) - Magatsuhi Skills (5) - Essence (5) - Glory (5) - Miracles (5) - Demon Statues (5) - Abscess (5)
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) - Follow Up - All-out Attack (Cut-in) - Heart Item (3) - Shuffle Time (3+4) - Daily Life (3-5) - Activities (3-5) - Calendar (3-5) - Social Stats (3-5) - Social Link (3+4) - Tactics (3-5) - Requests (3-5; Q+Q2) - Clock (3P+3RE) - Linked Episode (3RE) - Great Clock (3RE) - Theurgy (3RE) - Arcana Chance (4) - Forecasts (Fusion / Weather) (4+5) - Boost (Q+Q2) - Power Spot (Q+Q2) - F.O.E (Q+Q2) - Confidant (5) - Technical (5+5S) - Treasure Demon (5+5S) - Party Switch (5+5S) - Baton Pass (5+5S; Q2) - Disaster Shadow (5R) - Fusion alarm (5R) - Persona Traits (5R) - Third Eye (5+5S) - Master Arts (5S) - BOND (5S) - Persona Points (5S)
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) - Skill Systems (GMT:TM) - Sword Exchange (GMT:TM) - Class (TMS♯FE) - Class Change (TMS♯FE) - Topic System (TMS♯FE) - Side Quests (TMS♯FE) - Ad-lib Performance (TMS♯FE) - Session (TMS♯FE) - Dual Arts (TMS♯FE)