The first demo was recorded, and it led them to the Warfare Noise I compilation, released in 1986, which also featured the bands Chakal, Sarcófago and Holocausto. This was a very important compilation for the promotion of the heavy metal scene of the Brazilian State of Minas Gerais, who had already yielded such bands as Sepultura and Overdose.
In 1987, Sílvio SDN left the band. The band then recorded its first LP, Immortal Force, in which they produced a vigorous death/thrash metal, deeply influenced by Slayer, Possessed and Bathory. The album, which is considered a classic release today, has been fully remastered, and contains new artwork and the songs from the band's first demo, previously released only on the LP Lost Tapes of Cogumelo, in 1990.