Despite having ventured twice into the Imperial City of the Abyss, Saleen was actually still quite young. But, not that he had his own kingdom, Saleen had a that showed his high status, and it could be seen upon looking at him that he was a man who was responsible of the fates of many.
The sorcerers needed to consider Saleen's words seriously. Ever since Lex had arrived and quickly regained command, the sorcerers had quickly realized that the she was not some soft pushover.
At the moment, Saleen had laid out the truth right before them. If they wanted to be part of the ruins' excavation, they would require Saleen's permission first.
It seemed that even Lex's authority wouldn't have been of any use in this case, as Saleen clearly felt that the ruins belonged to him. After all, he was the one who had discovered them.