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Breen dallos

Breen ship near the Dallos Cluster from Star Trek: Pioneer

The Dallos Cluster was a massive purple blue hued gaseous cloud which borders nearly one fourth of the Oralian sector. (Star Trek: Pioneer; Star Trek: Far Horizons)

Once Tyson Calok was traced there by the USS Pioneer, only to have them witness him destroying three Borg cubes. During the Coalition War, Breen and Starfleet forces have battled within it. ("In Custody")

In early 2383, the Breen made a third advance into the Dallos Cluster and ran into the USS Horizon, causing the Federation starship to risk an early jump, which lead the the ship's disappearance. ("Jump")

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