Dishonorable Thieves

There you are, dear guest! Eladia has told me everything. My interests are simple: help me, and we're even. We'll also check if you still have your wits about you after wandering around the desert for so long.
My friends have been harassed by the local brotherhood of thieves, damn their ancestors. We have no ways of fighting them. We have barely enough guards to keep our borders safe, and even if they could spare a man or two, they'd never figure out how to find these thieves...
But don't worry! My grandfather once found an artifact in the local sands. He said it "revealed everything that's hidden"! I don't need these things, but you'll probably find a use for it, yes?
Bring me ten daggers of these desert dogs - it will be enough.

How are the thieves? Do they understand now that you have to earn your living with honest work?

There! We are more useful than the local idlers called guards. They just collect taxes and nap in the shade. We can finally live in peace now.
I don't have any good news for you. I asked around, but no one told me anything useful. There are rumors of course. They saw a glow, and something went missing, but no one knows what happened.
I'm sorry. We won't forget your help - as soon as I hear something, I'll let you know.