This is a diverting, delightfully bad horror/parody centered around metal music. Released in 2015 and written & directed by Jason Lei Howden, "Deathgasm” follows a group of teenagers in Auckland, New Zealand, who form an extreme metal band called Deathgasm and unintentionally unleash dark forces that take over the people living nearby. "Deathgasm” incorporates elements from “Evil Dead II” (1987), “Trick or Trea…