Days before the 34th annual FMX Birthday Bash, we got word that a mystery band would be playing. And it was a true mystery, even to us. But hours before the show, some of our more attentive Facebook fans discovered who the secret band was.

Terror Universal features Dave Chavarri and Ahrue Luster of Ill Nino, who's coming to Lubbock this summer on the Civil Unrest Tour.

Rocking Slipknot-style masks, the band played a short, but brutal set inside the Lonestar Amphitheater. What else would you expect from a band that describes their music as "horror metal"?

The band recently added a new singer named "Plague" after former frontman Chad "Rott" Armstrong left the band following allegations by Otep singer Otep Shamaya that he sexually assaulted her at a concert meet and greet.

More From KFMX FM