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Fourth Sphere of Expansion

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The Fourth Sphere of Expansion was a Sphere of Expansion of the Tau Empire.

Launched in the aftermath of the Third Sphere of Expansion, which had ground to a halt due to Imperial counterattacks in the Damocles Gulf, the Fourth Sphere was an ill-fated expedition. Its forces were deployed at the time of the formation of the Great Rift and subsequently lost. When the Warp Storms caused by the formation of the Great Rift began to die down, the Tau would launch a Fifth Sphere.[1]

It's possible that elements of the Fourth Sphere lost in the Warp may have reappeared elsewhere, as evidenced in the Red Scar Campaign.[2]

Sources