There's one included in the free Master's Vault 5e adventure that you might be able to adapt to what you're doing. I also did a review of an Add On called Rune Puzzles that might be of interest. <a href="https://www.youtube.com/watch?v=rR_GUpqGoYM" rel="nofollow">https://www.youtube.com/watch?v=rR_GUpqGoYM</a>
