Compromise

This is the best thing I can get around here. But the task I give you is totally dependant upon your ability.
Marylith Liquid can be found across the river and have a lot of valuable things, like gems. Bleth always likes expensive things. Just recently, Maryliths killed some noblemen from Tullan and stole a very precious gem called the Jewel of Darkness. I haven't seen it yet, but one thing is for sure, we'll find it!

Destroy <HFFFA7272>Marylith Liquids<HFFFFFFFF> at the <HFFFA7272>Warrior Plains<HFFFFFFFF> and get the <HFFFA7272>Jewel of Darkness<HFFFFFFFF>. If you succeed, give it to <HFFFA7272>Comerciante Bleth, west of Delfaras Plaza<HFFFFFFFF>, and tell him this is it.

I don't feel comfortable doing this, but Delfaras and Tullan are two totally different cities, aren't they? Bleth will decide whether to sell it or give it to someone else. So, destroy some <HFFFA7272>Marylith Liquids<HFFFFFFFF> in the <HFFFA7272>Warrior Plains<HFFFFFFFF> and then get the <HFFFA7272>Jewel of Darkness<HFFFFFFFF>. If you succeed, give it to <HFFFA7272>Comerciante Bleth west of Delfaras Plaza<HFFFFFFFF>.

Oh, this is the Jewel of Darkness! Of course, I've heard about it. I heard it was lost in Tullan and that it's worth untold sums of Gold. Famous gems are hard to sell, but I'll be able to get a fortune for this one!
Okay, I'll stop bothering Sydney. Good job!