Frontman Josh Middleton says: "Mercy is the first single off the new album. It's got a pretty dark and heavy vibe to it, but it's one of the most melodic tracks on the album at the same time.

"It's got a big, slow, doom outdo with an octave pedal on the guitars, so that's going to rumble some guts live." Dormant Heart is the follow-up to 2012's Monolith and Middleton recently revealed it's their most aggressive work to date.