Mercy is perhaps these days best known as the band that once featured Messiah Marcolin of Candlemass fame. Messiah sang on two of their albums, 'Mercy' and 'Witchburner', before he joined Candlemass. The debut EP preceding him is reported to be more NWOBHM-ish (and also a bit like Judas Priest) than Doom, as is the first album 'Mercy' that features Messiah. 'Witchburner' features some of the purest Doom-metal around (with a few more uptempo passages and tracks). The music is more in the vein of bands like St. Vitus than Candlemass however. After Messiah left, the band recorded material that never got released due to problems with various labels. They released one more album themselves before breaking up. The final release, 'Underground', is a solo recording by André Veljaca with a session drummer.