Yeh'kinya

Yeh'kinya is or was a worshipper of the evil Hakkar the Soulflayer, possibly an Atal'ai, and used to be a level 41 quest giver located at Steamwheedle Port in Tanaris. He tricked the player character into helping him bring Hakkar back into the world of Azeroth through a series of quests. With the help of Prospector Ironboot, he was exposed as a worshipper of the evil god at the end of the quest. When the adventurer confronted Yeh'kinya with this knowledge, Yeh'kinya escaped by turning into a green wind serpent, yelling yell as he flew out over the sea. It is then that the player was sent to Yojamba Isle by Ironboot, in order to speak to the Zandalar trolls and discover how to defeat Hakkar. This was a precursor to the Zul'Gurub quests.

Yeh'kinya was removed as an NPC from the game in patch 4.0.3a, and Steamwheedle Port was destroyed in the Shattering. Most likely he had already left long before the Cataclysm when he was discovered to be a Hakkar worshipper, so his current status remains unknown.

Trivia
"Yeh" appeared to be Faceless for "The", fueling speculation that Hakkar is an Old God.