Hades is mentioned in the Bible and is a part of Christianity. Hades is a place where people go when they die. It's like Heaven and Hell combined. People who are good go to Heaven and bad people go to Hell. Hades is a little different because it's a place where people who don't really deserve Heaven or Hell go. It's kind of like they just stay there until they make a decision about what they should do with their lives. It's kind of like a waiting room.