DEFICIENCY is a French Melodic Thrash Metal band, born in 2008. Both influenced by classic Thrash Metal bands and new waves of Modern Metal, DEFICIENCY gives a strong alliance between old school and modern Metal Music.
The band released its first album "State Of Disillusion" in 2011 which was well recieved with positive comments from the professional and the public audience.

After many concerts in France and abroad, opening for Decapitated, Evile or Suicidal Angels, the band records its second album "The Prodigal Child" at the Dome Studio (Lyzanxia, One Way Mirror, T.A.N.K.) with David Potvin who gives a very strong production to Deficiency's music. With this new opus, DEFICIENCY offers 10 songs that push its Melodic Thrash Metal to the very edge of brutality, power and technics, with also a large spectrum of sonorities.
"The Prodigal Child" is a concept-album that let the listener embark on an exciting quest of an intriguing truth about the origin, the fate and the becoming of humanity. The album releases on 10.19.2013 and is available through the main distribution networks. The many reviews of this new album are unanimous, and place DEFICIENCY among the most promising European Thrash Metal formations.
The band starts the long "Prodigal Tour 2013-2015" to defend its new album on stage. DEFICIENCY plays on many festivals ("Lezard'Os Metal Fest", - with Napalm Death, Onslaught, Asphyx...-, "Rock Your Brain Fest" - with Carcass, Destruction, Coroner, Vader...-) and shares the stage with french headliners (Gorod, Benighted, No Return, Bukowski) or international bands like MACHINE HEAD or TESTAMENT. In March 2015, DEFICIENCY takes place on the "Conquering Europe Tour" with european Thrash masters Suicidal Angels, Angelus Apatrida and Dr.Living Dead. The stage is definitely the place where DEFICIENCY exprimes its whole potentiel and motivation.

On March 2017, the band releases its third album "The Dawn of Consciousness"