After battling some naga in Azshara, Thersa stopped to rest on the beach and drank some water from one of the tidepools there. Something in the water she drank has made her terribly ill, so much so that none of the healers among the tauren, orcs, or trolls have been able to cure her condition. In desperation, Thersa has traveled to the Undercity to seek the help of the Apothecaries.
She may be related to Lakota Windsong.
She is involved in the following quests given by Chemist Cuely:
It doesn't seem to bother Overseer Kraggosh that she dies after drinking an elixer.