Fusion Accident
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Fusion Accidents, known as Mutations in the Last Bible series, are a recurring game mechanic in the Megami Tensei franchise. Fusion Accidents are unexpected outcomes that randomly occur during Fusion, most often resulting in a different Demon or Persona than the one intended.
Overview
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Fusion Accidents are a random occurrence that may occur during Fusion in some Megami Tensei games. When a Fusion Accident occurs, the expected outcome does not occur and the original Demon or Persona components are lost. This most often results in an entirely different fused entity than the intended result, one that may be significantly weaker or more powerful. Some Demons of certain Races can only ever be obtained as allies from Fusion Accidents.
Mechanics by Game
Shin Megami Tensei II
Shin Megami Tensei III: Nocturne
In Shin Megami Tensei III: Nocturne, fusion accidents give a different demon than what is said during the fusion process. The fusion accidents are more likely to happen when the moon is fullest, and least likely to happen when it is darkest.
Shin Megami Tensei: Strange Journey
Fusion Accidents have a 1/64 probability of occuring normally. This is doubled during a New or Full Moon or if a D-Source is used, increasing the probability to 1/32. If both are true, then the probability is quadrupled to 1/16. The Fracastoro Sub App guarantees that Fusion Accidents never occur, while the Copernicus Sub App instead guarantees that they always occur. Zealot demons can only be made through Fusion Accidents.
When inheriting skills, the demon resulting from the Fusion Accident will inherit the skills the original demon would have inherited, disregarding inheritance restrictions.
The demon resulting from a Fusion Accident is a random demon fulfilling all of the following conditions:
- It is not the original result.
- Its base level is between 3 lower and 2 higher than the original result's base level (inclusive).
- It does not have a fusion condition or require a Special Fusion.
- Its Race is not Herald, Vile, Deity, Reaper, Fury, Tyrant, Fiend, UMA, Enigma, Mitama or Prime.
- If a Zealot demon could be selected and the Zealot Summons Sub App is enabled, all other Races except Zealot are excluded.
- It is not password-exclusive.
Shin Megami Tensei IV
Shin Megami Tensei V: Vengeance
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The Hare of Inaba, Kinmamon, and Amabie can only be fused through fusion accidents.
| Condition | Probability | |
|---|---|---|
| Normally | With Miracle | |
| Normally | 1/128 | 1/8 |
| Full Moon | 1/16 | 1/2 |
| New Moon (with 2 living demons) | 1/128 | 1/8 |
| New Moon (with 1 near death demon) | 1/16 | 1/2 |
| New Moon (with 2 near death demons) | 1/8 | 1/1 |
Persona 4
The Velvet Room inhabitants will have question mark icons over their heads when Fusion Accidents occur. There is a 1/64 chance of triggering a fusion accident when fusing two Personas, and a 1/32 chance of triggering when fusing three Personas.
There are two types of accidents that can occur: The normal fusion accident will result in a Persona of any arcana other than the Fool, 10 levels under the protagonist. The wild card fusion accident will result in a Fool Persona that is 3 levels over the protagonist. There is a small possibility the player might still fuse the Persona they were trying to fuse in the first place.
Persona 5 Royal
Accidents can occur at any time during fusion, though the odds are typically very low. Regardless of the outcome, the Personas involved in the accident are replaced by the new result. If an accident occurs when fusing normal-strength Persona, the result is a random Persona that inherits the prior-chosen skills with no Arcana Burst experience boost and there is no interruption to fusion.
During a Fusion Alarm, all activities within the Velvet Room have greater effectiveness, and the chance of an accident greatly increases for all options but Lockdown. Purchasing Persona from the Compendium registry also increases the likelihood of an accident, including for Group Guillotine special fusions. If no Persona are purchased beforehand, the first action during an alarm will have no chance for an accident and will yield a stronger-than-usual outcome. The affected Persona's name will be displayed in yellow instead of white for the duration of the alarm, and it is considered "strengthened" for the purposes of subsequent fusions during the alarm.
Further actions in a different activity have some chance of accident, while an immediate repeat of the same activity or any action while using a yellow-named Persona are nearly guaranteed to trigger an accident. When an accident occurs while using a strengthened Persona during a Fusion Alarm, the alarm ends and the protagonist must re-enter the Velvet Room to continue further fusion.
Fusion (Guillotine)
If a strengthened Persona causes an accident during the alarm, the resulting Persona will be randomized and have a full spread of skills pulled randomly from a set pool of configurations. There are eleven configuration results for fusing a normal Persona with a strengthened persona, and fourteen set configurations for fusing a strengthened Persona with another strengthened Persona.
Sacrificing (Gallows)
When a Fusion Accident occurs during an Alarm while using the gallows, the benefiting Persona will gain no experience and instead receive a randomized distribution of stat points. The benefiting Persona will gain 5 stat points from a normal Persona sacrifice, 10 stat points if a strengthened persona was the sacrifice; and 15 stat points if both the benefiting and the sacrificed Persona are in the strengthened state. Because the usual once-per-day-per-Persona limit does not apply to Sacrifices made during a Fusion Alarm, the stat benefit from an alarm accident may be applied multiple times per day to the same Persona for rapid stat growth.
Itemization (Electric Chair)
Some Skill Cards are only possible to obtain via fusion accident during a fusion alarm. Using a strengthened Persona in the electric chair can result in an element booster or element resistance card based on the following parameters:
- Element resistance cards are based on the Persona's resistance types (e.g., a Persona with a Repel resistance can itemize to a Repel [Element] skill card, or Drain resistance to a Drain [Element] skill card, while a Persona with both Repel and Drain for different elements may itemize to either Repel or Drain cards).
- Element resistance cards and Boost/Amp cards are not possible for any element Weakness a Persona has.
- Dodge [Element] and Evade [Element] are solely possible based on a Persona's Weaknesses to any elements, except Dodge Phys or Evade Phys, which are always possible.
- Adding an element resistance via an accessory or skill card is taken into account for the pool of skill card outcomes.
- Dodge/Evade cards and Boost/Amp cards are more likely from low-level and mid-level Personas (<70), while Repel/Null/Drain/Resist cards are more common from higher level (70+) Personas.
In Persona 5 Royal there are no Gun or Almighty resistance/evasion skills, or Phys booster skills. Almighty Boost and Almighty Amp exist as skills but cannot be obtained through skill cards. Some elemental resistance or booster skill cards can also be obtained via other means, but many are exclusive to itemization accidents with a strengthened Persona.
| Ability | Accident-Exclusive Skill Cards (Strengthened Persona) |
|---|---|
| Psy Boost, Curse Boost | |
| Psy Amp, Curse Amp | |
| Repel Curse, Repel Fire | |
| Drain Bless, Drain Ice, Drain Wind, Drain Psy, Drain Nuke | |
| Dodge Bless, Dodge Curse, Dodge Fire, Dodge Elec, Dodge Wind, Dodge Psy, Dodge Nuke, Dodge Phys | |
| Evade Bless, Evade Curse, Evade Fire, Evade Ice, Evade Elec, Evade Wind, Evade Psy, Evade Nuke, Evade Phys | |
| Resist Bless, Resist Curse, Resist Fire, Resist Ice, Resist Elec, Resist Wind, Resist Psy, Resist Nuke, Resist Phys | |
| The following can be obtained by accidents, but have other sources: Dodge Ice can be obtained once via DLC Challenge Battle (Level 20 Trial), Null Phys can be obtained once via Mementos Request "Winners Don't Use Cheats", Drain Elec can be obtained from Challenge Battle: Foggy Day, and Drain Fire can be obtained via Challenge Battle: Full Moon. Drain Fire and all other obtainable skill cards omitted from the above categories are available via non-accident Electric Chair Fusion Alarm itemization of Personas or via Negotiation. |
If a standard Persona is itemized and a Fusion Alarm Accident occurs, the result is typically incense with a strength determined by the level of the Persona itemized. However, a rare result of a skill card or accessory may also occur. The results are pulled from the following pool:
| Level | Fusion Alarm Accident Itemization (Normal Persona) |
|---|---|
| Megido skill card*, Divine Grace skill card, Alluring Belt, Mighty Ring, Lucky Belt, random Incense (Stat +1)* | |
| Heat Up skill card, Ailment Boost skill card, Hell Ring, Almighty Ring, Miracle Belt*, random Ambergris Incense (Stat +2)* | |
| Life Aid skill card, Fortify Spirit skill card, Amrita Shower skill card*, Angelic Grace skill card, Deadly Fury Belt, random Nirvana Incense (Stat +3)* | |
| Items marked with (*) are not exclusively obtained through Fusion Alarm Accident |
Persona 5 Strikers
Nomenclature
| Language | Name | Meaning |
|---|---|---|
 Japanese
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合体エラー[citation needed] Gattai erā | Fusion error |
合体事故 Shin Megami Tensei III: Nocturne Shin Megami Tensei: Devil Summoner Persona 4 Persona 4 Golden Gattai jiko |
Fusion accident | |
| ミューテーションLast Bible Last Bible II Last Bible III Myūtēshon |
Mutation |
Reflist
- General
- Japanese P5R Wiki: Fusion Accident Combinations
- Shin Megami Tensei V: Vengeance Official Perfect Guide. p. 49.
- "Chapter 1: Systems", Persona 4 The Golden: The Complete Guide, Dengeki Playstation Editorial Staff. Published by Kadokawa (2012). Japanese. p. 71. ISBN-13: 978-4048866637.
- Specific