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Shin Megami Tensei: Nocturne has the unique sacrificial fusion mechanic, which is only carried out in a Full Kagutsuchi phase. 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. In the main Shin Megami Tensei series, fusions are made at the Cathedral of Shadows. In Megami Tensei games, gattai ( 合体, gattai) ?, called fusion here, is possible at a Jakyou no Yakata ( 邪教の館, jakyo no yakata) ? Shin Megami Tensei series Series-specific Rules Megami Tensei series when unambiguously rendering this concept in English.

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


But there are many exceptions to this rule. 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). 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. A demon created via this system will inherit certain traits and abilities from the "ingredient" demons that were used to create it. Certain demons in Shin Megami Tensei III: Nocturneįusion, or Union (合体, gattai) ?, is the system in which two or more demons are combined together to create a new demon.
