The Chosen are marked by the Dark Gods themselves.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Chosen of the Dark GodsURL Copied!
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Chosen have for the Eye of the Gods special rule. If the result rolled is Damned by Chaos or Dark Apotheosis, that result is immediately applied to the unit’s Chosen Champion (if the unit does not contain a Chosen Champion, the result is instead treated as a ‘The Eye Opens’ result), otherwise the result is applied to every Chosen model in the unit.