I wonder if, after Melkor was cast into the Void, Mairon would ever sneak away to Lammoth and wander there in loneliness, hoping to hear the echo of his Master’s voice. Was that place still there then?
“Then Morgoth sent forth a terrible cry, that echoed in the mountains. Therefore that region was called Lammoth; for the echoes of his voice dwelt there ever after…” - J.R.R. Tolkien, The Silmarillion