Tenebrosus was founded in May 2000 by two brothers: Valefor (guitar) and Hades (drums) and Michal (vocals). Their first and utmost inspiration was Norwegian Black Metal scene; however, the future was to show that it actually didn"t influence their musical style a lot. After nine months of intense rehearsals the band entered the Selani Studio, where they recorded their promo material "Tenebrosus - Promo 2001". It was released by the band without any financial support (500 copies in CDR format) and was received really well both in Poland and abroad. In the meantime Tenebrosus played a few gigs; they also finished work on their new material. But unfortunately problems came then and Tenebrosus had to suspend their musical activity for a while. After this break the band was joined by a bass player M.. Their promo material was re-edited in the end of 2002 in Spain (by Wolf Records) as split-MC with Angmar form Finland. It was released in the limited edition of 166 hand-numbered copies. In the beginning of 2003 Worm Tongue became a new vocalist. Shortly after the band prepared pieces for their first full-length "The Fall of Worthless Morals" and signed a deal with Metal Mind Productions.