Question: Which American heavy metal supergroup formed in 1991 was formed in the same city as the band Arson Anthem in 2006?

Context paragraphs:
Charred Walls of the Damned: Charred Walls of the Damned is an American heavy metal supergroup formed in 2009 consisting of drummer Richard Christy, bassist Steve Di Giorgio, vocalist Tim "Ripper" Owens and guitarist Jason Suecof.  The band was formed by Christy after a five-year absence from the metal scene since joining "The Howard Stern Show" in 2004.  They have released three studio albums.

Down (band): Down is an American heavy metal supergroup that formed in 1991 in New Orleans, Louisiana.  The band's current lineup consists of vocalist Phil Anselmo (Pantera), guitarist Pepper Keenan (Corrosion of Conformity), guitarist Bobby Landgraf (Honky), bassist Pat Bruders (Goatwhore), and drummer Jimmy Bower (Crowbar, Eyehategod, and Superjoint Ritual).  Since their formation, Down has gone on hiatus twice and they have released five studio albums.  The first three were LPs entitled "NOLA" (1995), "" (2002), and "" (2007).  In 2008, the band began working on additional material, which resulted in two EPs entitled "Down IV – Part I", released in September 2012 and "Down IV – Part II", released in May 2014.

Wovenwar: Wovenwar is an American heavy metal supergroup from Southern California, formed in 2013.  They released their self-titled debut album on August 5, 2014.  The band's musical style on the album has been described as hard rock, alternative metal, melodic metalcore and modern heavy metal.

Dead Cross: Dead Cross are an American hardcore punk and heavy metal supergroup formed in Southern California.  The band consists of guitarist Mike Crain (Retox), bassist Justin Pearson (the Locust, Head Wound City and Retox), drummer Dave Lombardo (Suicidal Tendencies, Misfits, Slayer and Fantômas) and vocalist Mike Patton (currently of Faith No More, Tomahawk and Fantômas).

Hank Williams III: Shelton Hank Williams (born December 12, 1972), known as Hank Williams III and Hank 3, is an American musician, singer and multi-instrumentalist.  Williams' style alternates between outlaw country, punk rock and metal.  He is the principal member of the punk metal band Assjack, the drummer for the Southern hardcore punk band Arson Anthem, and was the bassist for Pantera singer Phil Anselmo's band Superjoint Ritual.  He has released seven studio albums, including five for Curb Records.  Williams is the grandson of Hank Williams, the son of Hank Williams, Jr., and the half-brother of Holly Williams.

Allen-Lande: Allen/Lande or Allen-Lande is an international hard rock/heavy metal supergroup formed in 2005 by Italian record company Frontiers.  Although the band was originally from Italy, none of the band members are Italian.  It takes its name from its two singers, Symphony X vocalist Russell Allen and former Masterplan vocalist Jørn Lande.

Patrick Bruders: Patrick Bruders is an American musician, best known as the current bassist for heavy metal supergroup Down, the former bassist of the blackened death metal band Goatwhore from 1997 to 2004, and the former bassist for the seminal sludge metal band Crowbar from 2005 until 2013.  In 2008 he joined Eyehategod side project Outlaw Order and began live bass duties for the band, but has since parted ways with the group.  He began touring as live bassist with heavy metal supergroup Down in early 2011, replacing former bassist Rex Brown, before being added as a permanent member, performing bass duties live and in the studio.  Bruders is also a member of the New Orleans-based crust punk band Gasmiasma, Austin-based country band Pure Luck, and joined legendary doom metal band Saint Vitus for their performance at the Hammer of Doom music festival in Würzburg, Germany.

Krokodil (British band): Krokodil is a British heavy metal supergroup formed in 2011, currently consisting of vocalist Simon Wright (Liber Necris, Canaya, Evisorax), guitarists Laurent Barnard (Gallows), Daniel P. Carter (A, Bloodhound Gang, Hexes) and Chris Binns (Liber Necris), bassist James Leach and drummer Dan Foord (Sikth).  After making their live debut at Download Festival in 2013, they released their debut album Nachash in 2014.  Founding guitarist Alessandro Venturella (formerly of Cry for Silence) left the band that year to join Slipknot as their bassist, with Binns joining in his place.

Arson Anthem: Arson Anthem is an American hardcore punk band, formed in New Orleans in 2006.  The lineup comprises singer Mike Williams of Eyehategod, guitarist Phil Anselmo (best known as the vocalist for Pantera, Down and Superjoint Ritual), country musician, punk rocker and Assjack frontman Hank Williams III on drums, and bassist Collin Yeo.

Damnocracy: Damnocracy was a heavy metal supergroup formed on, and for, the VH1 TV show "Supergroup" in 2006.

Supporting paragraphs: Arson Anthem Down (band)
Answer: Down