It wound be fitting, as they even mad a film about mandraks... kinda.
but the new FAQ states it clearly, that not every unit that counts as a deamon, has the deamon special rule, what i finde stupid, but what the hell ;-)
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...What about a Bastion made out of Guardsmen as some form of sick sarcasm?...Or a Fortress of Redemption made out of Dark Angels - Sky Serpent