At the heart of Archaon's army is his old warband, the Swords of Chaos, the most dread group of Chaos Knights ever to have blighted the world. Only the strongest have survived in his long quest, leaving a cadre of hardened troops.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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If your army includes Archaon, one unit of Varanguard may be upgraded to be the Swords of Chaos for +3 points per model. This unit has the Hatred and Immunity (Psychology) special rules.