Devil's board

You are participants in a city quest in the "mystical thriller" genre. The legend promised an atmospheric adventure in the spirit of horror-reality: an abandoned orphanage, mysterious disappearances, occult symbols. The organizers assured: everything was under control, everything was just a game. But the deeper you go into the building, the more it seems that something has gone wrong. The "Northern Lights" orphanage was closed more than forty years ago after an investigation into the disappearances, in which no one was ever found guilty. According to unconfirmed rumors, a secret cult operated in the basement, sacrificing the wards in the name of an unknown force. The only surviving girl, Ella, drew a board with letters and eyes for many years until she was found dead in a psychiatric hospital room. It is said that if you find this board, you can hear the voices of those who never left the shelter's walls. You wanted to solve the mystery. But now it's solving you.