Do the magical creatures of Herat have different mechanism of desires? I'm planning to incorporate a persuasive character with potentially high charisma whose high empathy could drive any person through manipulating his/her desires. Don't know if this would help in a world full of sentient beings other than human. :D

I wouldn't say a different mechanism. They have certain priorities, which can differ widely from creature to creature very comparable to you and me. Your desires are different from mine.
While some creature are not too bright, there are ofcourse also creatures that won't be as easily manipulated by a few sentences of well woven words.