Thousand Sons are part of the Chaos Space Marines, who have sworn their allegiance to Tzeentch, the Chaos God of change, intrigue, and sorcery. However, they were once the XVth Legion of Space Marines of the Imperium of Man.
What distinguishes the Thousand Sons from other Traitor Legions is their number of psychic mutations. They also have an eternal quest for knowledge, and what they lack in subtlety, they make up for with pure arcane power.
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Thousand Sons can also be played in Kill Team, which you can read more about here.
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