[8] On June 5, Carnifex revealed that Alissa White-Gluz, vocalist of Arch Enemy, would be featuring in their new song.

Consequence gave the album a positive review and stated: "Overall, World War X is an absolute rush.

The band's ability to blend feeling and raw heaviness once again allows them to release a work of awesome brutality.

"[11] Sophie Maughan of Distorted Sound scored the album 8 out of 10 and said: "Whether World War X will become known as Carnifex's magnum opus remains to be seen.

"[13] Simon Crampton of Rock Sins rated the album 8 out of 10 and said: "World War X clocks in at just over 35 minutes and flys [sic] by far too quickly.