Hey, I’ve got a lead on an abandoned underground vault somewhere in the Rockies that’s rumored to hold a cache of encrypted ancient scrolls. Think you could crack the code while I navigate the tunnels?

Here’s a classic Caesar shift with a twist – rotate by 4 but the key letters are hidden in the phrase “Misty Mountain”. The cipher text is: Zpv lq jg d hqfhqz xqg qghh vqqrj. You’ll need to shift each letter back by 4, then look for the pattern “MM” to decrypt it. Good luck, explorer!

Nice work, I’ll keep the torch lit and the pack ready while you crack that lock. The vault’s about to reveal its secrets. Let's go!