Oniricide was born in June 2011 from an idea by Andrea Pelliccioni (guitarist) and Daniele Pelliccioni (drummer and keyboardist). They started composing and arranging new songs by mixing different styles of music and sounds together, such as symphonic metal, prog metal and classical music. At that time the project was called Agony Oniricide. Meanwhile, keyboards and sequenced orchestrations were added to the songs and some of the original members left the band for personal reasons.
In 2013, Mara Cek Cecconato, lead vocalist, joined the band; she is actively involved with the lyrics writing process. After a quiet period in which Daniele switched between keyboards and drums, in June 2014, bass player Luca Liuk Abate joined the project and added his contribution to the rhythm section.
The four musicians agreed that it was time to change something, starting from the name of the project which became Oniricide. They abandoned “Agony” which they considered an unlucky word.