Priority Omega was a Gallifreyan warning code.
A Time Lord soldier sent a Priority Omega message for the High Council reporting that Arcadia had fallen. (TV: The Day of the Doctor [+]Loading...["The Day of the Doctor (TV story)"])
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During the War in Heaven, the term "OMEGA level event" was used by the Great Houses for direct encounters with the Enemy. (PROSE: Subjective Interlock [+]Loading...["Subjective Interlock (short story)"])