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- I grieve that so much that was good now festers in the tower.3.10 — Book 3 Chapter 10 — The Voice of Saruman (82% in)
- But always they found its outward faces sheer, high and impassable, frowning over the plain below; beyond its tumbled skirts lay livid festering marshes where nothing moved and not even a bird was to be seen.4.1 — Book 4 Chapter 1 — The Taming of Smeagol (2% in)
There are no more uses of "fester" in The Two Towers.
Typical Usage (best examples)