In Star Wars The Last Jedi we got to see Snoke's massive Obsidian ring (when speaking to Rey and Kylo Ren) taken from the catacombs beneath Darth Vader's Castle on Mustafar (where Anakin Skywalker lost to Obi-Wan Kenobi). The visual dictionary has told us where the ring is from, however if we go back to Rogue One, we can gather even more info from all of this for today's theory.

Do you think Luke Skywalker ever went to Darth Vader's Castle? When did Snoke go there? Before or after Vader's life?

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