Enigma fusion

Enigma fusion is a concept in the Magical Vacation series, originally appearing in Magical Vacation.

Summary
Enigma fusion is a process by which an enigma fuses into the heart of a magician, but not unless the magician is vulnerable or willing to conduct a fusion. Once the fusion is complete, the vessel magician's thoughts are greatly amplified to match the same wavelength as the enigma, in turn releasing incredible amounts of power. Although the vessel's will and consciousness are still in tact while under possession, some drown in the power brought about by fusion, and gradually surrender themselves to the enigma. This causes the vessel to act erratically, and in time, the enigma takes over their consciousness and body. In some cases, magicians can control of the enigmas' power within them and still retain their consciousness.

A less common phenomenon is de-fusion with an enigma. In order for a magician and an enigma to separate, the vessel magician must relinquish all their magic. Although only two instances of de-fusion have ever been witnessed, those being Equillekrew from Candy and Kerendu from Ganache, doing so allows the former vessel to awaken to an expanded state of consciousness.