where was it recorded?
Hit City West in Los Angeles.
Reign in Blood
Reign in Blood" was recorded and produced at Hit City West in Los Angeles with Rubin producing and Andy Wallace engineering. 
what does still reigning refer to? A live performance DVD by the thrash metal band Slayer where was it performed? Augusta Civic Center which song did they sing? The song "Raining Blood" from the album "Reign in Blood".
wiki:13546288
Reign in Blood [SEP] Recording
"Reign in Blood" was recorded and produced at Hit City West in Los Angeles with Rubin producing and Andy Wallace engineering. The album was the label boss' first professional experience with heavy metal, and his fresh perspective led to a drastic makeover of Slayer's sound. Steve Huey of AllMusic believed Rubin drew tighter and faster songs from the band, and delivered a cleanly produced sound that contrasted sharply with their previous recordings. This resulted in drastic changes to Slayer's sound, and changed audiences' perception of the band. Araya has since stated their two previous releases were not up to par production-wise.