Slaughterhouse Slumber Party

What started as the debauched annual slumber party for a tight knit group of gal pals becomes a fight for their lives when supernatural evil threatens to destroy the world--and even worse, ruin the one night of the year the ladies get to have a nude pillow fight. Trapped by magic, surrounded by evil, and very underdressed, will they survive the night? Or will this slumber party become a slaughterhouse?