The mouth of Mistress Faruna, Nethan Marys, has a simple task for you. He has procured some Desert Siren Seeds, a particularly rare find and one that he knows will impress his mistress. He wants you to take the seeds to her in her tower at Tel Oren.
The simplest way to get there is to take a River Strider to Tel Ouada, catch a boat to Firewatch then head south along the coast until you reach the tower. Mistress Faruna is delighted to receive the seeds, and comments that she will have to reward Marys.
Head back to the Council House and Nethan Marys will reward you with Falar's Emberfist, a left Glove with Absorb Health and Fire Damage enchantment on touch. You also receive two House Telvanni faction reputation points.