In the pits of iron.

Over the course of Middle-earth history its villains have always been inventive in hiding the places of their habitation as much as they possibly could so that nothing and nobody could interfere with their evil deeds. Various camouflage devices have been applied, beginning with going deep underground to veiling tall towers in shadows and deceits. Unsurprisingly, the first bad boy to go subterranean was Melkor: he had set the trend for living below ground level way before the counting of time even started.

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