The Unnamable (1988) 

Back in the 1800's a lady gives birth to a monster. They decide that the baby is too ugly to name, therefore the monster is known as the "Unnamable". The creature brutally slaughters his family, and gets trapped in a vault. Go ahead to 1998, and some college students have heard the story about the unnamable and want to check out the vault... - IMDb

 

Watch the Full Movie