The worst thing about seeing Satan live, besides the sweltering heat and sulfur-scented merch booth, is that he insists on playing too many songs from the new album. Watch a Beelzebubian protégé play the hits you want to hear with today’s deal: for $21, you get one general-admission ticket to see Danzig Legacy at the Congress Theater during Riot Fest 2011 on Friday, October 7, at 7 p.m. (Up to a $45.78 value). Doors open at 6 p.m.

Metal and horror-punk legend Danzig pours a scolding cauldron of spine-tingling hits upon fans on the final day of his all-encompassing Legacy tour, which appropriately falls on the night of Halloween. With the stage presence of a brooding Minotaur, the croon of a drill sergeant, and lyrics that have inspired countless werewolf websites, Glenn Danzig’s three-tiered career has cemented him in the annals of dark-metal history. For this Legacy show, Danzig will deliver a spitfire set full of brimstone ditties about matriarchs, osseous matter, and fly-fishing. As a special Riot Fest treat, the Legacy show pulls members of Glenn’s seminal bands the Misfits and Samhain out of the hellmouth to race through the razor-apple classics that spawned a million jacket patches and motivated the Pumpkin King to renew his gym membership.

Today’s Groupon is good for the entire Riot Fest lineup for the night of Friday, October 7. Warming up the stage before the Danzig rampage, hardcore godfathers Youth of Today play straight-edge punk that hurls Molotov Shirley Temples at ears, and Macabre shreds with meaty metal about the sunny side of homicide. Rounding out the evening is Nachtmystium, who dips brick-thick Germanic metal in psychedelic formaldehyde, and The Infected, known for refusing to cover their mouths while unleashing communicable thrash-punk.