I just completed all 10 regular Monoliths on my Forge Guard and had no trouble unlocking empowered monoliths: https://imgur.com/a/2A49A6w
When I tried running Ending the Storm specifically, it was the only one out of 10 that did not give me the “Legendary” option. I ran one echo to see if I could exit and reset, but that option was not available. On the above picture, it shows level 100 (In progress), but I did not have a choice of Legendary. On this screenshot it clearly shows level 75: https://imgur.com/a/G0oiGTS
Does anyone know how I can get this bugged monolith to reset to the Legendary choice menu?