While en route to Coruscant for a debrief and repairs following the second invasion of Geonosis, Anakin Skywalker and Ahsoka Tano, accompanied by Obi-Wan Kenobi, are tasked with an urgent mission.

A neutral colony ship en route to an uncharted world near Wild Space was attacked by unknown forces, with no survivors found amongst the wreckage.

This is the third attack in such a manner in the past month alone, and pressure grows on the Senate and the Jedi to investigate. The Chancellor dispatches the three Jedi, the Cruiser Resolute, and the Clones of the 212th and 501st Legion to look into the attacks and find those responsible...

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In the Sol System of the Milky Way Galaxy, the Guardians of the Last City continue to fight a never-ceasing battle against the Darkness. With the threat of the Taken King ended, and the City once again safe from the malice of Oryx, the Vanguard turn their attention to Mars.

Ever since the deaths of several prominent Cabal commanders, including those of the Skyburners, the Cabal on Mars have grown desperate to survive against attacks by the Vex and intrusions by the Guardians.

However, rumors soon reach the Vanguard of a new Valus commanding what remains of Valus Ta'uarc's Siege Dancers combined with the Blind Legion. Combined, they have begun to spread out of the ruined City of Freehold and into Vex Territory. They are not looking to conquer, but to search for something.

With this new threat, the Vanguard sends the Guardians of Fireteam Horizon, the Heroes of the Last City, to investigate this new Commander and eliminate him and his forces to scatter the Cabal once again.

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Both of these stories shall soon meet, and must unite against a threat that would see both galaxies be sundered in the Darkness.