There are/were also at least 6 Metal bands with this name
1. Ignis Fatuus is a progressive metal band from northern Finland. Ignis Fatuus was founded by Ilkka Harjula and Jarno Juntunen around year 1992. The very first demo from this two-headed group was published year 1993. This unnamed tape contained very hard metal music both extremely fast and slow. The influences were Carcass and Paradise Lost at that time. Nowadays, Ignis Fatuus plays progressive metal with melodic riffs and growl vocals. Latest album, Fiends (2009) you can download from their homepage.