Features include:
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Gaining advantage on Charisma checks while concentrating on spells
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Dominating enemies you deal psychic damage to
Be sure to check out the other Dominus Duodecim subclasses:
Alternatively, get the full version of Codex Fantasia: Dominus Duodecim here, including all 12 subclasses, 12 spells, 12 feats, and 12 maneuvers!