A.A. Nemtheanga; born 26 August 1975) is an Irish musician most notable for his vocal duties for the folk/black metal band Primordial.

Averill was raised in Sutton on Dublin's Northside and attended Mount Temple Comprehensive School.

[4] Averill traveled to Canada early to record vocals for "Indoctrine", the debut album from Blood Revolt with Vermin and J.

He also fronts Twilight of the Gods, a supergroup, originally intended as a live-only Bathory tribute, that includes drummer Nick Barker (ex-Cradle of Filth, ex-Dimmu Borgir, ex-Testament, ex-Exodus), guitarist Rune Eriksen (Aura Noir, ex-Mayhem), guitarist Patrik Lindgren (Thyrfing), and bassist Frode Glesnes (Einherjer).

In 2008, he received a Journalism degree from Dublin City University and is a staff writer for Zero Tolerance magazine.