Who is the heaviest metal band with a woman lead singer?

The heaviest metal band with a woman lead singer is Crucified Barbara, a Swedish heavy metal band formed in 1998 in Stockholm, Sweden. The band is composed of lead vocalist and guitarist Mia Coldheart, guitarist Klara Force, bassist Ida Evileye and drummer Nicki Wicked. Crucified Barbara's sound has been described as a mix of classic heavy metal, hard rock and punk rock, with a strong emphasis on guitar work and powerful vocals. The band has released six studio albums, two live albums and one EP, and has toured extensively throughout Europe, North America and Japan.