Tome of Set Dungeons, Page 14 suggests you are talking about the set dungeon for Might of the Earth, I think. If you have the 6 piece set for that, you will have access to it. I will look for it on my Earth Barbarian.
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Find me on PS4 at: jimmyjamzO5. I play Diablo 3 on PS4. It's soo addicting. LOL.
Also, check out my Monday stream of Diablo 3 on PS4, on Twitch. I stream at 3 pm Central Daylight Time.