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Megami Tensei Fusion Tools - Fusion Theory

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Basic Fusion Rules

Normal Fusion

Formula

1. Ingredient A x Ingredient B = ?
   • Consult the game's corresponding demon list to obtain each ingredient's race and base level
2. Determine Race R
   • Consult the game's corresponding normal fusion chart
   • Find the row that starts or ends with Race A
   • Find the column that starts or ends with Race B
   • Race R = Intersection of the two
   • If Race R = None, the fusion is invalid
   • For Persona series only: Intersection must lie in upper-right half of chart, if it does not, flip Race A and Race B
3. Determine Result R
   • Consult the game's corresponding demon list
   • Level R = Math.floor((Base Level A + Base Level B) / 2) + Game-specific Normal Level Modifier
   • Result R = Next-highest non-special result (neither red nor green) with Race R with base level >= Level R
   • If Level R > All non-special results with Race R, the fusion is invalid
4. Ingredient A x Ingredient B = Result R

Example 1

1. Persona 4 Golden: Current Level 50 Girimehkala x Current Level 31 Mithra = ?
   • List of Personas - Persona 4 Golden
   • Girimehkala: Race A = Moon, Base Level A = 48
   • Mithra: Race B = Temperance, Base Level B = 31
2. Determine Race R
   • Fusion Chart - Persona 4 Golden
   • Moon (row) x Temperance (column) does not lie in upper-right half of chart, so lookup Temperance (row) x Moon (column) instead
   • Race R = Temperance (row) x Moon (column) = Hanged (upper-right)
3. Determine Result R
   • List of Personas - Persona 4 Golden
   • Persona 4 Golden Normal Level Modifier = 1
   • Level R = Math.floor((48 + 31) / 2) + 1 = 40
   • Next-highest Hanged persona with base level >= 40 is Yatsufusa at level 49, but Yatsufusa is green indicating a special fusion
   • Result R = Next-next-highest Hanged persona with base level >= 40, Taowu at Level 56
4. Persona 4 Golden: Current Level 50 Girimehkala x Current Level 31 Mithra = Base Level 56 Taowu

Triple Fusion

Formula

1. Ingredient A x Ingredient B x Ingredient C = ?
   • Consult the game's corresponding demon list to obtain each ingredient's race and base level
   • Ingredient C = Ingredient with the highest current level
   • If multiple ingredients are tied for the highest current level, Ingredient C = Ingredient with the highest-priority race
   • Consult the game's corresponding demon list for race priority: By default, demons are sorted from higher to lower-priority races
2. Determine Race AB
   • Consult the game's corresponding normal fusion chart
   • Find the row that starts or ends with Race A
   • Find the column that starts or ends with Race B
   • Race AB = Intersection of the two
   • If Race R = None, the fusion is invalid
   • For Persona series only: Intersection must lie in upper-right half of chart, if it does not, flip Race A and Race B
3. Determine Race R
   • Consult the game's corresponding triple fusion chart
   • Find the row that starts or ends with Race AB
   • Find the column that starts or ends with Race C
   • Race R = Intersection of the two
   • If Race R = None, the fusion is invalid
   • For Persona series only: Intersection must lie in lower-left half of chart, if it does not, flip Race AB and Race C
4. Determine Result R
   • Consult the game's corresponding demon list
   • Level R = Math.floor((Level A + Level B + Level C) / 3) + Game-specific Triple Level Modifier
   • Result R = Next-highest non-special result (neither red nor green) with Race R with base level >= Level R
   • If Level R > All non-special results with Race R, the fusion is invalid
5. Ingredient A x Ingredient B x Ingredient C = Result R

Example 1

1. Persona 4 Golden: Current Level 32 King Frost x Current Level 27 Makami x Current Level 32 Neko Shogun = ?
   • List of Personas - Persona 4 Golden
   • Ingredient C must be Neko Shogun or King Frost
   • Because King Frost comes before Neko Shogun in the persona list, Ingredient C = King Frost
   • Makami x Neko Shogun x King Frost = ?
   • Makami: Race A = Hanged, Base Level A = 27
   • Neko Shogun: Race B = Star, Base Level B = 32
   • King Frost: Race C = Emperor, Base Level C = 22
2. Determine Race AB
   • Fusion Chart - Persona 4 Golden
   • Race AB = Hanged (row) x Star (column) = Empress (upper-right)
3. Determine Race R
   • Fusion Chart - Persona 4 Golden
   • Empress (row) x Emperor (column) does not lie in lower-left half of chart, so lookup Emperor (row) x Empress (column) instead
   • Race R = Emperor (row) x Empress (column) = Fool (lower-left)
4. Determine Result R
   • List of Personas - Persona 4 Golden
   • Persona 4 Golden Triple Level Modifier = 5
   • Level R = Math.floor((32 + 27 + 22) / 3) + 5 = 32
   • Next-highest Fool persona with base level >= 32 is Black Frost at Level 38, but Black Frost is green indicating a special fusion
   • Result R = Next-next-highest Fool persona with base level >= 32, Decarabia at Level 46
5. Persona 4 Golden: Current Level 32 King Frost x Current Level 27 Makami x Current Level 32 Neko Shogun = Base Level 46 Decarabia