Sigileth wants to search the various wrecks that populate Shedax Khîn to ensure none of them carried her brother to his death.
'Our ship was more fortunate than some of the vessels torn apart by the Grinding Jaws, ${PLAYER}. See where the hulks lie, their hulls smashed upon the rocks, their masts ripped away? Did the ship which carried my brother toward Umbar fall prey to a similar fate?
'Search the wrecks in this lagoon for any sign that the ships of Nakási Wave-reaper or her ally Tatháta succumbed to the rocks of Shedax Khîn. I hope and believe they did not... but for Corudan's sake we must be certain.'
Sigileth asked you to search several of the shipwrecks at Shedax Khîn in search of her brother.
Sigileth is further south of the wrecks you investigated in Shedax Khîn.
Sigileth handed you a note she found within a bottle discovered on one of the wrecks in Shedax Khîn.
Sigileth is south of the wrecks you investigated in Shedax Khîn.