In their halls of stone,

from J. R. R. Tolkien – Ring Poem on Rap Genius

Meaning

Dwarves made their homes by carving into mountains, which allowed them to easily mine the metals below their halls. Unfortunately, excessive digging released this guy:

This balrog, or “demon of might,” of Morgoth wrecked the most powerful dwarven city, Khazad-Dum, where one of these dwarf-lords ruled.

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