IXXI was formed early 2006, in Stockholm, Sweden by Acerbus and Nattdal. Some pre-recordings where made and Totalscorn joined. Some months passed and Avsky and Selin was recruited to the squadron, and in July 2006 IXXI entered Endarker Studio to record the first self-titled album. In October a video for the track "Ancient Spirits Are" where recorded. Almost a year after the recording of the S/T-album it was finally released by Total Holocaust Records in June 2007.
The very same month, June 2007, IXXI entered Endarker studio once again to record the second opus Assorted Armament. Selin left the band pre to the recording and was replaced by Smoker. The album was released in December 2007 by Sigilla Malae, and about that time IXXI was joined by Talon.
In April, 2008, IXXI signed a contract with Candlelight Records UK, whom will release the next album, entitled Elect Darkness. The album was recorded this summer.
IXXI's first live show was performed the 28th of May, 2008, in front of an enthusiatic and wild crowd at H62 in Stockholm.
Monday: A man comes home, phones his boss to resign from his job, writes mysterious letters, cleans his apartment and swallows poison in his bathtub. His death is simultaneous with the death of his fish, the only being that was close to him.