Arn (species)

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Ahn has been suggested.

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Arn
Affiliated with:	Rhodians
Notable individuals:	Miss Quill's arn
First mentioned in:	For Tonight We Might Die
First appearance:	Detained
Appearances:	TV: The Metaphysical Engine, or What Quill Did

You may be looking for the individual.

An arn was a creature about the size of two human thumbs, with teeth and poisonous claws, which was used in a punishment by the Rhodians. When they would release it into the brains of those to be punished, it would burrow itself inside. The creatures would telepathically link its host with a particular Rhodian, and then they would be their slave. (TV: For Tonight We Might Die)

The arn were artificially created from multiple different species. This was enough to give them a concept of belief. They believed they came from a woodland paradise. (TV: The Metaphysical Engine, or What Quill Did)

At least in Miss Quill's case, if she used a weapon other than her own hands, failed to protect Charlie or attempted to remove the arn, it would kill her. She was also not allowed to tell him lies. (TV: For Tonight We Might Die)

Dorothea Ames and the Governors were able to remove the arn from Miss Quill's head, leaving her with a scar over her eye. (TV: Detained)