Question: When was the American death metal band formed in who's album is The Wretched Spawn?
Context: Incantation is an American death metal band that was formed by John McEntee and Paul Ledney in 1989.  They are one of the leaders in the New York City death metal scene along with fellow bands Suffocation, Mortician and Immolation, even though the band is currently located in Johnstown, Pennsylvania.  To date the band has released ten full-length records, two live records, four EPs, two singles, three splits, one DVD, and three demos.  Their most recent album "Profane Nexus" was released through Relapse Records in August 2017.  The band have maintained a significant cult following and underground popularity since the 90s, and are considered to be highly influential on a range of later death metal bands including Dead Congregation, Grave Miasma, and Portal, who are often described as 'cavernous death metal'.  Incantation's music frequently draws on anti-Christian, Satanic and occult themes, and the band is notable for mixing widely varied tempos into their music, often playing slow, down-tuned passages similar to those performed by death-doom bands like Autopsy. Obituary is an American death metal band formed in October 1984 in Tampa, Florida.  Initially called Executioner, the band changed their name to Xecutioner in 1986 to avoid confusion with the thrash metal band Executioner from Boston, and then changed their name once again to Obituary in 1988.  The band's current lineup consists of vocalist John Tardy, lead guitarist Kenny Andrews, rhythm guitarist Trevor Peres, bassist Terry Butler, and drummer Donald Tardy.  Obituary has gone through several lineup changes, with Peres and the Tardy brothers being the only constant members.  The band was a fundamental act in the development of death metal music, and is one of the most successful death metal bands of all time.  To date, Obituary has released ten studio albums, and with the exception of their 1997–2003 split, they continue to perform live around the world. George "Corpsegrinder" Fisher (born July 8, 1969) is an American extreme metal vocalist for the American death metal band Cannibal Corpse, the lesser-known melodic death metal band Paths of Possession, and the lesser-known extreme metal supergroup Serpentine Dominion.  He recorded two albums with Florida's Monstrosity before leaving and joining Cannibal Corpse in late 1995, replacing vocalist Chris Barnes, who is now the vocalist for Six Feet Under.  He also provided guest vocals for New York technical death metal band Suffocation on the songs "Reincremation" and "Mass Obliteration" from their debut album, "Effigy of the Forgotten", as well as guest vocals for California deathcore band Suicide Silence on the song "Control" from their fourth album, "You Can't Stop Me".  Fisher also performed guest vocals on Job for a Cowboy's 2014 album "Sun Eater" on the song "The Synthetic Sea."  As a death metal vocalist, Fisher employs the "death growl" extended vocal technique. Cannibal Corpse is an American death metal band from Buffalo, New York.  Formed in December 1988, the band has released thirteen studio albums, two box sets, four video albums, and two live albums.  The band has had little radio or television exposure throughout its career, although a cult following began to build after the release of the 1991 album "Butchered at Birth" and 1992 album "Tomb of the Mutilated".  As of 2015, they had achieved worldwide sales of two million units for combined sales of all their albums, making them the top-selling death metal band of all time. Morbid Angel is an American death metal band based in Tampa, Florida formed in 1983 by guitarist and sole remaining original member Trey Azagthoth, original vocalist and bassist Dallas Ward, and original drummer Mike Browning.  Widely considered as one of the most influential bands in the genre and important in the transition of death metal from its thrash metal roots, they were one of the first bands to incorporate guttural vocals, up-tempo blast beats, atonality in guitar playing, multiple tempo changes and dark atmosphere.  They have been described as one of "the most influential and emulated bands in death metal", alongside Cannibal Corpse, and have been cited as an influence by many later bands.  They were also the first death metal band to experience mainstream success in connection with being signed to Giant Records in 1992, heavy rotation of their music videos on MTV, and having the music video for the song "God of Emptiness" shown on an episode of "Beavis and Butt-head".  Their first four albums are considered classics in the genre. Mortem is a death metal band formed in 1986 in Lima, Peru.  They are the first Peruvian metal band to have toured Europe and the United States.  Mortem’s musical style is firmly rooted in the death metal, black metal and thrash metal of the nineteen-eighties.  Mortem's characteristic heavy sound is defined through slow and sinister death metal alternated with fast and aggressive counterparts.  Frantic tremolo picking in the style of early Possessed and Death built on passionate rhythmic percussion topped with wailing atonal and melodic guitar solos comprise a potent mix which lives up to the principle of death metal technique to craft pounding ritualistic and spirited death metal.  Vocals are forged from guttural rasps and often develop into high shrieks while lyrics deal mainly with the occult and anti-Christianity. Death was an American death metal band from Orlando, Florida, founded in 1983 by guitarist and vocalist Chuck Schuldiner.  Death is considered to be one of the most influential bands in heavy metal and a pioneering force in death metal.  Its debut album, "Scream Bloody Gore", has been widely regarded as the first death metal record, while the band's driving force, Chuck Schuldiner, is acknowledged as the originator of extreme metal.  Death had a revolving lineup, with Schuldiner being the sole consistent member.  The group's style also progressed, from the raw sound on its early albums to a more sophisticated one in its later stage.  The band ceased to exist after Schuldiner died of glioma and pneumonia in December 2001, but remains an enduring metal band. Wretched is an American extreme metal band from Charlotte, North Carolina founded by Marshall Wieczorek and Steven Fundenburk in 2005.  Wretched's musical style incorporates elements of melodic death metal, deathcore, and technical death metal. Deicide is an American death metal band formed in 1987 by brothers and guitarists Brian and Eric Hoffman and drummer Steve Asheim as "Carnage", then hiring bassist/vocalist Glen Benton and becoming "Amon".  They would later change the band name to Deicide in 1989.  The band rose to mainstream success in 1992 with their second album "Legion", and is credited as the second best-selling death metal band of the Soundscan Era, after Cannibal Corpse.  Since their debut album in 1990, Deicide has released eleven studio albums, one live album, two compilation albums and two live DVDs.  In November 2003, their first two albums, "Deicide" and "Legion", were ranked second and third place respectively in best-selling death metal albums of the SoundScan era.  Deicide is known for their lyrics, which cover topics such as Satanism, anti-Christianity and blasphemy.  Their lyrics have resulted in bans, lawsuits and criticism from religious groups and the public. The Wretched Spawn is the ninth studio album by American death metal band Cannibal Corpse.  The cover art is by Vincent Locke.  This is the last studio album to feature Jack Owen, one of the band's founding members, and up to 2012's "Torture", the last with an album cover depicting violence and gore.  The album was distributed with a making-of DVD produced by Nick Sahakian.  "The Wretched Spawn" is Cannibal Corpse's fourth album to be named after one of the tracks on the album, after "Butchered at Birth", "The Bleeding" and "Gallery of Suicide".
Answer: December 1988