Sheyan had only heard the name of the Twilight Council less than 24 hours ago. More precisely, he had learned about it from the Protoss hero Tochego.
The reason was because the main reason Sheyan had come to this place was to find Ronnie's whereabouts, and Ronnie was closely related to the Dark Templars, so that was what Sheyan's investigation had focused on. Regarding this topic, Tochego had told him with confidence that according to the legends, the origin of both the Dark Templar and the High Templar lay in the ancient, powerful and long-lost Twilight Council.
Sheyan examined his surroundings. From the architectural style and decorative patterns, he could basically confirm that they were in the style of the Protoss, but many of the details were different from what he had seen before in the other Protoss base. Therefore, Sheyan was sure that this place had absolutely no relation to the Protoss force led by Uraki.
Sheyan naturally had his reasons for making such an assumption.