Demoniac were a heavy metal band from New Zealand formed in Wellington in 1993 by singer and bass player Lindsay Dawson, guitarist Sam Totman and Drummer Steve Francis. They later moved to London, UK. Three of the members went on to form DragonForce. Their rather unusual musical style has often been labeled as "blackened power metal".
Demoniac were formed the year after 1991.
They were formed in 1993, not 1992. It's difficult because the system might interpret the phrase "year after 1991" to mean any year after 1991 and not just 1992.