Children of Hyacinth. Arcana Europa

Iulian Dalca is a twenty-one-year-old musical prodigy with big dreams. He's also blessed with a hint of light magic in his blood, a gift that's apparently unique to prodigies and whose purpose appears to be the developing of an extremely strong connection between artist and audience during a performance. Unknown to most, the gift of light magic also allows him a powerful and inexplicable psychic link to someone who remains invisible, a person he's never met in the real world.
It's a connection that strengthens over time, a symbiotic bond whose purpose remains a closely guarded secret among the goddesses believed to have created it. Cosmin Vasile is an eighteen-year-old young man living in obscurity and poverty in a rural village in the Wallachian countryside. Gifted in song, he spends his time adding to his parents' meager income by weaving and gathering wool for sale, singing rustic songs he knows by heart as he works.
He's also plagued by mysteriously restless sleep lasting a week and occurring once a year since he turned eleven, though he remembers nothing of the dreams or nightmares that may have caused the disturbance. Then out of the blue on two separate occasions, a once-in-a-lifetime chance at fulfilling their dearest dreams suddenly comes along, and youthful hope takes flight... Only to tumble headlong down a nightmarish pit of old magic twisted for a darker purpose, where lines separating reality and decades-long madness blur.
Haunting portraits of long gone students, a cursed mirror hiding a terrifying world of corruption and death, a monstrous satyr lurking in the shadows of the mirror's world - time and hope for escape disappear as Iulian and Cosmin suddenly discover the awful price of being marked as the Muses' rare, favored children.