After the latest Risen debate, I've a suggestion:

An ability to teach Risen that allows us to command them to DISGUISE. It would set the visible noun to match one of the following:

Humanoid:
* Town NPCs (veteran, minstrel, etc).
* Trader Hirelings

Beast (but not Abomination/Monstrosity):
* Horses
* Familiars

Each time the monster speaks (or any time), there's a chance its true noun is revealed, and reverts to current appearance and highlighting.

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Fhtagn.