so I am a little over halfway through the season finale, they have found the masonic symbols on the big stone bulkhead(not HIM), and all I can think is
"You fear to go into those mines. The Masons delved too greedily and too deep. You know what they awoke in the darkness of the crescent mine... shadow and flame."
could be a dragon tho, too
Update: neither Balrog nor dragon...