Legion is a cryptic, religious website on the Deep Web in Welcome to the Game. Rather than containing music, visiting the site plays a loud ship horn to startle the player.
Under its logo and motto, "I am the punishment of God..If you had not committed great sins, God would not have sent a punishment like me upon you," the block of grey text has a chance of hiding a Red Room code within it (on the right side).
The first four letters of the message, MIIF, is a question on The Gatekeeper.
Trivia
The name Legion could be a Biblical reference, specifically Mark 5, where a devil named Legion is cast out.