Fusion Alarm
Fusion Alarm is a game mechanic for Fusion that appears in Persona 5 Royal.
Overview
During a Fusion Alarm, the activities within the Velvet Room have greater effectiveness, and the chance of a Fusion Accident greatly increases following the first action performed. Once an accident occurs, the alarm ends. Fusion Alarms may also be ended prior to an accident by speaking to the Velvet Room attendants and choosing the dialogue option to end the alarm, or by leaving the Metaverse.
Mechanics by Game
Persona 5 Royal
Fusion Alarm becomes available in Persona 5 Royal after securing the route to Kaneshiro's Treasure and attempting to leave his Palace. The earliest date this can occur is June 21st.
After the ability is unlocked, Fusion Alarm will occur randomly following repeated victories against Shadows in the Metaverse, including wins via the Instakill Confidant ability from Chariot Rank 7. As the number of victories increases, the odds of the alarm being triggered also increase. Using the Celestial Reading from the Fortune Confidant available at Rank 8 will instantly trigger a Fusion Alarm and also increase the chance of future alarms for the day. While Celestial Reading is active, an alarm can trigger on the first battle after the end the first alarm.
When an alarm is triggered, a flash of the Velvet Room door glowing red shows on screen. The protagonist's internal monologue confirms the presence of an alarm when it begins and each time he enters a Safe Room, including from a loaded save that starts in a Safe Room.
Fusion (Guillotine)
Persona created from a fusion of two Persona during Fusion Alarms have 15 extra stat points distributed randomly, the maximum possible inherited skills, and a randomized mutation of 1-3 skills. Most commonly the skills change to the next skill within the family (e.g., Mapsio to Psiodyne) but the skills may mutate to something different altogether. These strengthened Personas have a yellow name and are guaranteed to cause a Fusion Accident when used in another action during the Fusion Alarm.
Itemization (Electric Chair)
When the Electric Chair is used during Fusion Alarm, the resulting Equipment or Skill Card is more powerful, such as the Gun Boost skill card becoming Gun Amp instead. For a full list of Persona itemization results during alarms, see Electric Chair. If a Fusion Accident occurs, the result varyies depending on the Persona level, resistances, and whether or not it was strengthened. Certain skill cards can only be obtained this way.
Strengthening (Gallows)
While sacrificing a Persona to strengthen another typically provides a certain amount of experience and a skill inheritance, a sacrifice during the Fusion Alarm provides additional experience and a 50% possibility of inheriting a second skill. Normal experience from the gallows is doubled. Using non-Treasure Personas of matching Arcana becomes increases from 1.5x to 3x, using a non-Arcana-matching Treasure Demon increases from 3x to 5x, and using an Arcana-matching Treasure Demon increases from 5x to 7x.
Even during Fusion Alarm, a Persona can only be strengthened via gallows once per day, unless it is registered to the Compendium, removed from the protagonist's stock via fusion/dismissal, and then purchased again from the Compendium. It is possible for a Fusion Accident to occur when using the gallows, at which point the strengthened Persona will gain no experience and instead receive a randomized distribution of stat points and receives additional stats if an empowered Persona was involved.
Training (Lockdown)
Burning Incense during a Fusion Alarm doubles the stats gain for the Persona in Lockdown. A Fusion Accident cannot occur by using Lockdown or incense.
Nomenclature
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| Language | Name | Meaning |
|---|---|---|
 English
|
Fusion Alarm | |
 Japanese
|
合体警報 | Fusion Alarm |