Do not know if this is considered an exploit but because he is listed as a Tanaan Rare without the area open even though hes outside it. I think it qualifies. Feel free to move it.
This is the Rare
Keravnos - NPC - World of Warcraft
He has strong lightning attacks and hatches eggs near him, he is under water at approximately coords (40,83) he is near the coast of Tanaan. take a waterstrider out from shadowmoon. Solo-able but I recommend you bring a friend.