Vocalist Jesse Leach stated about the album that "It is with a grateful spirit that we prepare for this record's release". "From the music, to the lyrics, to the artwork, we are all proud of what we have accomplished. To me, this is by far my best vocal performance, much thanks to Adam's guidance and faith in my abilities. I am very grateful to be where I am in life, back in an amazing band with a record we are all excited for the world to hear. Thanks to all the fans for their warm welcome back and their undying love for Killswitch Engage."
Jesse Leach stated in an interview with Loudwire that "the music is definitely the fastest Killswitch record ever, it’s very heavy but still maintains the signature Killswitch hooky, melodic stuff there too. There’s definitely melody attached but I pulled out some new styles vocally, yelling and screaming and growling and layers and it sounds massive".
The album's first single, "In Due Time", was digitally released on February 5, 2013, and was made available for streaming on the band's YouTube channel on January 30, 2013. On February 27, 2013, the music video for "In Due Time" premiered on Rolling Stone's website. On March 18, 2013, Killswitch Engage unveiled a second song from the album, titled "The New Awakening", on their YouTube channel. On March 26, 2013, Killswitch Engage allowed the completed album to be streamed online for 48 hours. A Special Edition version of the album, with alternate cover art, is also available digitally and on physical CD/DVD. The DVD contains a thirty-minute documentary detailing the making of the album.
Critical reception for the album was highly positive; aggregate review website Metacritic assigned an overall score of 79 out of 100, based on reviews from six professional critics.
Gregory Heaney from Allmusic gave the album three out of five stars saying "In the time since Leach left the fold, Killswitch Engage have matured into a tighter, more refined band than they were for Alive or Just Breathing, and while Leach has certainly grown as a singer in the intervening years, the album doesn't quite recapture that sense of catharsis the band possessed back then." Dean Brown from PopMatters gave the album a solid eight out of ten stars saying "Disarm the Descent is the bountiful fruit of the Killswitch’s rejuvenation, and proof that, in life and metal, there are second chances."