Thnad was a well-known Topwarpian highly notable for her costuming, teamaking, singing, and other such artistic skills. She always went out adorned in an elegant kimino-style and a hand-carved mask. It was often said that she had transcended species and achieved the status of a carefully and completely self-crafted entity.
One cycle, she disappeared.
Hydra does not have any record of a Thnad. At least not in any part that has been accessed by anyone.