Save your world. You need to destroy the artifact that connects demon to your world. You have to go through the portal to find the demon's shelter. There is a hellish altar with an artifact, but it's protected by runes. Each rune relate to specific type of hellish abomination. Therefore, you need to cleanse unnatural things and kill hell creatures. Help your friends escape from the imprisonment of demons. Watch your backs... and each others. Don't let them lock all players.