It’s the sort of technical death metal double bill that will shake your brain right out of its skull while simultaneously leaving you wondering how the various musicians involved were able to play so fast and accurately. Boston’s Revocation have been around since the turn of the millennium, and their seventh studio album, The Outer Ones, dropped a year ago — a phenomenal piece of work inspired by the novels of H.P. Lovecraft (hence all the eyes and tentacles on the sleeve art). Meanwhile, Canadian band Voivod have been dabbling in these dark arts since ’82, blending prog with thrash long before Mastodon came along. Voivod also put out an album a year ago, the superb The Wake, so it makes sense that the bands are touring together. Psycroptic, Skeletal Remains and Conjurer also play.

Revocation and Voivod play with Psycroptic, Skeletal Remains and Conjurer at 6:30 p.m. on Saturday, September 28 at the El Rey.