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This page details the process of fusion in Devil Children Black Book and Red Book.

Fusion Systems

Black Book and Red Book have a total of five different fusion systems, whose availability changes depending on the version being played. They are:

Fusion System Availability

Name	Black Book	Red Book
Partner Fusion	✔	✔
Racial Fusion	✔	✘
Pure-Blood Fusion	✘	✔
Mixed-Blood Fusion	✘	✔
Link Cable Fusion	✔	✔

Partner Fusion

Partner Fusion consists of fusing the protagonist's demon partner (Cerberus in Black Book and Gryphon in Red Book) with another demon.

Upon fusion, the partner will gain experience points equal to six times the amount given when defeating that demon in battle. Upon gathering enough experience points, the partner will level up, which increases their maximum HP, MP, and a total of +4 points will be distributed among their stats. In this process, the partner's level cannot exceed the protagonist's by more than 5.

Even if the partner does not level up, a random number of points will be distributed among their stats upon fusion, based on the level difference between them and the demon being fused.

Points Granted Upon Fusion

Amount	Level Difference (Demon − Partner)
+0	−30 or less.
+1	−29 ~ −1
+2	+0 ~ +2
+4	+3 ~ +5
+5	+6 ~ +10
+7	+11 ~ +14
+8	+15 ~ +19
+10	+20 or more.

Racial Fusion

Racial Fusion is a system similar to the fusion process present in most Megami Tensei games. It consists of fusing two demons of different races to create a demon of a third race. Demons up to five levels above the protagonist can be created.

The race of the resulting demon is determined as per the following table. Mute-race demons can only be created via fusion accident. Boss-race demons cannot be used or created in Racial Fusion.

Racial Fusion Table

Race	Mute	Yoma	Drake	Specter	Oni	Divine	Akuma	God
God	Yoma	Oni	Divine	Drake	Drake	Specter	Divine	-
Akuma	Oni	Drake	Divine	Yoma	Specter	Drake	-
Divine	Drake	Oni	God	Yoma	Dog	-
Oni	Specter	Akuma	Yoma	Akuma	-
Specter	Divine	Divine	Oni	-
Drake	Akuma	Akuma	-
Yoma	God	-
Mute	-

Finally, the resulting demon will be the lowest-leveled member of the target race whose level is greater than the following:

$\frac{\text{First demon's level}+\text{Second demon's level}}{2}+2$

Number of Innate Skills

Each demon has a total of six innate skills. Demons recruited via negotiation or obtained via events have access to their first three skills, while demons created via Racial Fusion also have access to the fourth skill.

The fifth and sixth skills cannot be learned via Racial Fusion, and by extension in Black Book as a whole.

Innate Skill Availability

Skill	Recruited	Fused
First	✔	✔
Second	✔	✔
Third	✔	✔
Fourth	✘	✔
Fifth	✘	✘
Sixth	✘	✘

Skill Inheritance

A demon created via Racial Fusion can inherit up to three skills from the component demons. Only magic skills are inheritable, not physical skills.

Those skills are manually selected by the player and the only restriction is that demons cannot inherit a skill from an element they're weak to.

As a demon only has six skill slots and demons created via Racial Fusion have four of those slots filled, inheriting the final skill requires overwriting one of the demon's innate skills.

Weakness Table

Demon Type	Weak to
Fire	Water
Water	Earth
Earth	Wood
Wood	Metal
Metal	Fire
Sun	Moon
Moon	Sun

Fusion Accidents

Fusion accidents have a 10% chance of occurring when a demon of the God and/or Akuma races are involved. The result of a fusion accident will always be a demon of the Mute race.

Mute-race demons will be one rank lower than the expected result of the fusion.

For example, should a fusion accident occur between a level 13 and a level 15 demon, the following will happen: inputting those numbers on the level formula will result in 16, so the expected result would be the level 17 demon Fairy; however, the result will be a level 15 Waira instead.

Pure-Blood Fusion

Pure-Blood Fusion is the process of fusing a demon with an identical demon.

The second demon will be consumed, increasing the first demon's HP and MP by a random value. The limit of a demon's maximum HP and MP is tied to the protagonist's level.

HP/MP Limit per Level

Max HP/MP	Protagonist Level	Max HP/MP	Protagonist Level	Max HP/MP	Protagonist Level	Max HP/MP	Protagonist Level	Max HP/MP	Protagonist Level	Max HP/MP	Protagonist Level	Max HP/MP	Protagonist Level
59	1	166	11	286	21	419	31	564	41	721	51	891	61
69	2	178	12	299	22	433	32	579	42	738	52	909	62
79	3	189	13	312	23	447	33	594	43	754	53	927	63
90	4	201	14	325	24	461	34	610	44	771	54	945	64
100	5	213	15	338	25	475	35	625	45	788	55	963	65
111	6	225	16	351	26	490	36	641	46	805	56	981	66
122	7	237	17	364	27	504	37	657	47	822	57	999	67 and higher
133	8	249	18	378	28	519	38	673	48	839	58
144	9	261	19	391	29	534	39	689	49	856	59
155	10	274	20	405	30	549	40	705	50	874	60

Number of Innate Skills

Each demon has a total of six innate skills, but only have three of them available at first. Upon undergoing Pure-Blood Fusion, a demon has a chance of unlocking their final three innate skills. This process is not guaranteed to happen and the exact odds are unknown.

Should the demon have less than three open skill slots, the player is free to choose which skill or skills to overwrite.

Evolution

Certain demons may evolve upon undergoing Pure-Blood Fusion a certain number of times. The player is warned when that will happen, and will be given the choice of whether to allow for evolution or just keep increasing the demon's maximum HP and MP.

Demons up to five levels above the protagonist may be created. If the protagonist is not high-leveled enough, evolution is not possible even if the minimum number of fusions has been reached, only allowing for HP and MP upgrades.

The evolved demon will have access to three of its innate skills, and may inherit up to three magic skills from its previous form, as long as they're not of an element the demon is weak to.

If any of the demon's stats, HP, or MP exceed the natural value of its evolved form, that value will be kept. For example, if a demon with 500 maximum HP and 50 Attack is to evolve into a demon that has 400 maximum HP and 40 Attack, it will keep the 500 maximum HP and 50 Attack.

Evolution Table

Demon	Evolves Into	No. of Fusions
Bifang	Rukh	5
Deva	King Deva	5
Bastet	Neko Shogun	5
Feng Huang	Zhuque	5
Komainu	Yatsufusa	5
Shiisaa	Barong	6
Nekomata	Bahan	5
Asura	King Asura	5
Tsukuyomi	Scathach	8
Van	King Van	9
Principality	Virtue	6
Kyriotes	Merkabah	8
Seraph	Archangel	9
Ego	Satan	9
Gnome	Issun-boshi	5
Pixie	Sylph	5
Rakshasa	King Rakshasa	5
Ghoul	Mummy	6
Robot	Android	6
Counting Sheep	Makura-gaeshi	5
Makura-gaeshi	Baku	5
Banshee	Dullahan	6
Mizuchi	Otohime	5
Basilisk	Cromm Cruach	5
Orochi	Yamata no Orochi	6
Naga	Ananta	7
Ratatoskr	Kamaitachi	5
Yukinko	Yuki-onna	5
Kudagitsune	Nine-Tailed Fox	5
Frost Ace	King Frost	5
Harpy	Siren	7

Mixed-Blood Fusion

Mixed-Blood Fusion is the process of fusing two different demons.

The level difference between the first and the second demon cannot be lower than -20, and two demons of the same race can be fused.

Each demon in the game has two hidden numerical values not mentioned in any official source, and they will henceforth be called Base Value and Add Value, with the latter always being lower. Upon fusing two demons, the result of the fusion will be a demon of the same race as the first demon, with the lowest Base Value that is greater than the following:

$\text{First demon's Base Value}+\text{Second demon's Add Value}$

Using the following demons as an example:

Race	Demon	Level	Base Value	Add Value
God	Nekhbet	4	8	3
Akuma	Nekomata	5	9	3

By fusing Nekhbet and Nekomata, the resulting demon will be of the God race as that is the race of the first demon used. Nekhbet's Base Value and Nekomata's Add Value together form 11. As such, the resulting demon will be Tatari Mokke, who has a Base Value of 10.

However, by fusing Nekomata and Nekhbet, the following will happen: the resulting demon will be of the Akuma race as that is the race of the first demon used. Nekomata's Base Value and Nekhbet's Add Value together form 12. As such, the result of the fusion will remain Nekomata, as the next strongest Akuma-race demon, Ammut, has a Base Value of 14.

If the resulting demon is different from the fusion components, it is considered as sacrificing the second demon to evolve the first. The resulting demon will have access to three of its innate skills, and may inherit up to three magic skills from its previous form unless they belong to an element the demon is weak to. If any parameter, HP, or MP from the first demon exceeds that of the fusion result, those values will be kept.

If the resulting demon is the same as the first demon used in fusion, it is considered as sacrificing the second demon to strengthen the first. A random number of points will be distributed among the stats of the first demon, based on the level difference between the first and second demon.

Boss-race demons can only be used as the first demon in Mixed-Blood Fusion, and the resulting demon will always remain the same.

Points Granted Upon Fusion

Amount	Level Difference (1st Demon − 2nd Demon)
+1	−20 ~ −1
+2	+0 ~ +2
+4	+3 ~ +5
+5	+6 ~ +10
+7	+11 ~ +14
+8	+15 ~ +19
+10	+20 or more.

Link Cable Fusion

This type of fusion occurs when two players have their consoles connected via link cable. This is also achievable in the PS1 remake by connecting two save files in the multiplayer menu.

Each player contributes one demon to the fusion.

If both copies connected are of Black Book, Racial Fusion will be performed and both players will receive a copy of the resulting demon.

If both copies connected are of Red Book, either Pure-Blood or Mixed-Blood Fusion will be performed depending on the demons chosen and both players will receive a copy of the resulting demon.

If a copy of Black Book and a copy of Red Book are connected, Racial Fusion will be performed on the Black Book side and Mixed-Blood Fusion will be performed on the Red Book side. In this case, each player will receive a different demon.

Unfusable Demons

The following demons cannot be created via Racial Fusion or Mixed-Blood Fusion. They are only obtainable via negotiation, events, evolution, or the casino.

Unfusable Demons

Race	Demon	Level
God	Kotodama	14
God	Rukh	17
God	King Deva	18
God	Neko Shogun	21
God	Zhuque	32
God	Yatsufusa	34
God	Quetzalcoatl	37
God	Barong	38
God	Tanuki no Namamono	42
Akuma	Bahan	14
Akuma	King Asura	17
Akuma	Stymphalides	19
Akuma	Jersey DevilPS1 only	21
Akuma	Nue	31
Akuma	Black Raja	34
Akuma	KiyohimePS1 only	35
Akuma	Behemoth	46
Akuma	Scathach	50
Akuma	King Van	54
Divine	Skull Crown	51
Divine	Raziel	25
Divine	Virtue	32
Divine	Sariel	41
Divine	Merkabah	46
Divine	Archangel	52
Divine	Satan	54
Oni	Issun-boshi	9
Oni	Sylph	16
Oni	King Rakshasa	17
Oni	Nitanita	20
Oni	KeukegenPS1 only	22
Oni	Cyborg DekaPS1 only	23
Oni	Toushin	26
Oni	Zenki GokiPS1 only	28
Oni	Dwarf	31
Oni	Mummy	32
Oni	Boogeyman	34
Oni	Android	39
Oni	Davy-kun	41
Specter	Makura-gaeshi	13
Specter	Red Cape	18
Specter	Melissa	21
Specter	Baku	23
Specter	Persona	29
Specter	Abe no SeimeiPS1 only	32
Specter	RokurokubiPS1 only	34
Specter	Dullahan	40
Specter	Taigong Wang	50
Draco	Otohime	14
Draco	Cromm Cruach	27
Draco	Yamata no Orochi	34
Draco	Yinglong	40
Draco	Ikkaku Dragon	41
Draco	Leviathan	46
Draco	Ananta	49
Yoma	Bunbuku ChagamaPS1 only	10
Yoma	Kamaitachi	15
Yoma	Yuki-onna	16
Yoma	MoaiPS1 only	19
Yoma	Neko no Namamono	21
Yoma	BrowniePS1 only	24
Yoma	Kaguya-himePS1 only	26
Yoma	Nine-Tailed Fox	29
Yoma	King Frost	31
Yoma	Cu Sith	34
Yoma	Siren	41
Yoma	Daji	45
Mute	King ParameciumPS1 only	36
Mute	ExcaliburPS1 only	46
Boss	Diana	12
Boss	Hel	12
Boss	Vibhishana	18
Boss	Vritra	18
Boss	Indra	19
Boss	Hresvelgr	20
Boss	Fenrir	20
Boss	Abaddon	20
Boss	Paimon	22
Boss	Sphinx	26
Boss	Asmodeus	26
Boss	Demogorgon	26
Boss	Death Sphinx	30
Boss	Belial	33
Boss	Hell Sphinx	35
Boss	Uriel	36
Boss	Raphael	36
Boss	Azel	46
Boss	Lucifer	48
Boss	Michael	48
Boss	Gabriel	48
Boss	Sphinx	50
Boss	Hoshigami	50
Boss	Berith	51
Boss	Phegor	53
Boss	Metatron	54
Boss	Zebul	55
Boss	ZeusPS1 only	60
Boss	AmaterasuPS1 only	60
Beast	Cerberus	5
Beast	Gryphon	5
Beast	Death Cerberus	17
Beast	Death Gryphon	17
Beast	Hell Cerberus	30
Beast	Hell Gryphon	30
Beast	King Cerberus	45
Beast	King Gryphon	45

Racial Fusion only

The following demons may only be created via Racial Fusion, not any other fusion type.

Unfusable Demons

Race	Demon	Level
Mute	Paramecium	2
Mute	Mecchi	5
Mute	Shock	9
Mute	Agathion	13
Mute	Fairy	17
Mute	Nidhoggr	25
Mute	Franken	30
Mute	Snappy	35
Mute	Xiezhai	40
Mute	Ganesha	47
Mute	Simurgh	48
Mute	Odin	54