The band was found in 1998 by Belfegor and Firebliss. They are brought together during their mutual work in Dark Inversion in the period of 1996-1998.

The desire to make something different gave birth to REUNION. Their first production was called "Infernal Kingdom" - a fine piece of symphonic black metal, which in 2002 was released in restricted circulation by Counter Attack. Their second album - "Stream of Hate" was finished in January 2004. "Stream of Hate" is a direct old-school black metal in the way of the Norwegian standards in that music. The real difference with the former album is the total absence of synths which were the leading instrument creating the atmosphere of "Infernal Kingdom". The musicians explain it with a kind of nostalgia to the "old times, when black metal was young". "Stream of Hate" impresses with direct music, ferocious singing and great guitars. In October 2004 Reunion signed with  ShadowLand Music and in November the same year "Stream of Hate" was released.

Since the release of "Stream of Hate" Reunion have taken place in a couple of events: Metal Repulsive Blasphemy Festival (16 April 2005 in Sofia) and Decadence Festival (17 December 2005 in Varna). Additional musicians participated for Reunion in both occasions: Shurale (played bass at Metal Repulsive Blasphemy Festival), Pilota (guitars at both appearances) and Agarvaen (bass at Decadence Festival).

The band is currently working on its third album.