When THERION came into being in 1988 by changing name from the already existing band BLITZKRIEG, which was founded a year earlier, Christofer had rather taken inspiration from SLAYER's "Reign In Blood"among other classic metal albums. At the beginning, the Swedes were firmly rooted in death metal, a genre which they helped to define, as witnessed by their debut album "Of Darkness...."(1991). Yet even back then, there were hints of "something else" lurking beneath the rough surface.
The use of female vocals is another core ingredient of THERION today, which developed gradually. CELTIC FROST had basically introduced the female element to extreme metal on "To Mega Therion"in 1985. THERION began with both a female and male vocalist emulating a church like choir already in their sophomore full-length 'Beyond Sanctorum' (1992).