The band was formed around 1995 as a continuation of Festerday. They recorded two demo tapes, "Wave" in 1995, which was never officially released, and "Mare Liberum" in 1997, which was released by Swedish Defender Productions. Right after the release they got a three record deal with Season Of Mist. With a new label they fulfilled their deal and released three albums, "Dynamic Gallery of Thoughts" and "WAR Vol I (split with Bloodthorn)" in 1998 and "The Symmetry Of 1, The Circle of O" in 1999. After this they signed to Century Media and released "Allotropic/Metamorphic - Genesis of Dimorphism (A.M.G.O.D.)" in 2001 and their last album so far, "Cypher" in 2002.
The band hasn't really had any line-up changes, but they've changed their names (which are very odd by the way) a few times.
In 2005 the band changed name to Havoc Unit.
2013 band is called again Festerday.