By now both Southern Lord recording artists Boris and Sunn 0))) should be no strangers to this universe. Boris has previously 4 full length albums through Southern Lord and Sunn 0))) has released 5 full-length albums with the Lord. The ALTAR album is not a split album. ALTAR is a collaboration album between the two groups that is the result of both bands conceptualizing, writing and recording the album together as one entity. Both groups have stepped outside their previous sounds and created a wholly unique album that stands on it's own unique ground.