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- His spies slip through every net, and his birds of ill omen are abroad in the sky.3.2 — Book 3 Chapter 2 — The Riders of Rohan (70% in)
- But that would be an ill omen, if it were so.4.5 — Book 4 Chapter 5 — The Window on the West (65% in)
There are no more uses of "omen" in The Two Towers.
Typical Usage (best examples)