The Brotherhood III - Young Demons
They put on ritualistic garments, gather weapons, and prepare to lose themselves in the Occult world.  On Friday nights, a group of extreme teens pretending to be wizards and warriors breaks into the school to play "The Game," a macabre role-playing ritual.  This time they've gone too far.  Using an ancient book of spells, they unlock a medieval world that fills the halls with evil and unleashes a murderous nightmare.  Using treachery and deathly deceptions, they must draw upon their darkest powers to stay alive.