Nauxus's Plead
You can try this quest before fighting the first boss too, and it is highly recommended you do before trying "the spy"! (below this one).
There is a place far south of the tavern, explore it until you can move forward. A new place should come up to the west, and, if you explore enough, you can find Nauxus, talking to an upset female lizard with her child present; her husband is a spy sent to the bull tribe by Nauxus himself, hence the argument. You will be asked to find him by Nauxus, who turns out to be the lizard tribe's chief, and tell that spy a phrase to let him know he can trust you.
This quest does NOT enable "the spy" quest below, but will give you another choice to complete it.