In 1996, guitarist Rastko Lupulović, also working as an actor, made the decision to become a monk, parting to the Visoki Dečani monastery, and getting the monk name Ilarion.
During his sojourn in Serbia at Visoki Dečani, he wrote a biography of Stephen Uroš III Dečanski of Serbia, hymn for the church service honoring Stefan of Dečani, a report on the transfer of the remnants of Saint Paraskeva to Serbia, and he also rewrote the Service to St. Petka (Paraskeva).