Their fifth studio album, Avenged Sevenfold's album Nightmare debuted at No°1 on the Billboard 200 Chart and No°5 on UK OCC chart in 2010.

Following the unexpected death of drummer Jimmy "The Rev" Sullivan, the album is dedicated to his memory and a reflection of death and despair.

Dream Theater's Mike Portnoy would step in to finish the recording. Metal Hammer rated the album eight out of ten.

Billboard rates four out of five and Kerrang! gave the album four K's out of five. The album won Golden God Awards for Best Drummer, Best Guitarist, and Album of the Year.

Nominated for Kerrang! Awards Best Album and Single (Nightmare) & Revolver Magazine's Song of the Year 2011 for Buried Alive.

"Like their previous outings, the group incorporates a New Wave of British Heavy Metal influence throughout Nightmare while paying tribute to `80s hair metal with guitar god appeal; but playing retroactive music doesn't seem to concern them, as long as they play it more skillfully than their forefathers.

The group's influences may be worn on their sleeves, (check out the chugging Metallica "One" breakdown in "Buried Alive," or the Queensrÿche-style power-ballad "Victim"), but there is no denying that they have some of the best chops in the metal world.

M. Shadows continually amazes with his vocal acrobatics, the opening riff of "Natural Born Killer" ramps up to an inhuman speed.

"Save Me" ends the album as one of their most epic songs to date, in a proper 21 gun salute, as thunderous blasts and guitar divebombs interweave into a heartfeltoutro.

It's a fitting tribute for their fallen 28-year-old comrade, and excellent proof of the band's ability." - allmusic.com For Fans of Metallica, Slipknot, Bullet For My Valentine, NWOBHM, Heavy Hair Metal, Metal