The Neethians were a humanoid race with inflexible, almost crystaline features, which made their moods more difficult to interpret than those of most other humanoid species. They apparently had a scent that could cause a Vulcan discomfort. Voreborers plagued Neethian space travelers since they discovered space travel.
In 2156, the Enterprise encountered a damaged Neethian passenger liner. The Enterprise was unable to help the craft and instead ended up calling another Neethian ship. (ENT - The Romulan War novel: To Brave the Storm)