At the Heart of Winter is the fifth studio album by Norwegian black metal band Immortal. It was released on February 22, 1999 through Osmose Productions. It is the first Immortal album not to feature Demonaz on guitar, as he suffered from acute tendinitis in his hands. The album marks a shift in Immortal's musical sound, towards a black metal and thrash metal fusion.At the Heart of Winter was recorded in November 1998 at Abyss Studios in Sweden. It is the first Immortal album not to feature a picture of the band on the cover, and the first to prominently feature the band's new logo. The cover art was painted by J.P. Fournier.