Board Thread:General Mod Discussion/@comment-33185350-20171014150536/@comment-33185350-20171014165637

Where does it say that Durin’s Bane was the only one? “The Balrogs were destroyed, save some few that fled and hid themselves in caverns inaccessible at the roots of the earth...” - The Silmarillion, Of the Voyage of Earendil and the War of Wrath. I would say there is a chance you could run into a balrog down there, but very, very small (as in say, like one balrog for 2-3 hrs. of mining). So as to not replace Utumno.