Yamdor was the personal slave and body servant of the scientist Ras Thavas. Though he was very large, he was surprisingly gentle in his touch and graceful in his movements. It was rumored that he was the result of an experiment in which the brain of a woman had been put into the body of a man; whether or not this was true remains unrevealed.

As the head of Ras Thavas' household, Yamdor was noted for his jealousy and vindictiveness, especially towards Vad Varo; he was perfectly willing to send other slaves into the consignment of Ras Thava's morgue for slights against himself.

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