This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Travel to Durnholde Keep and set 5 incendiary charges at the barrels located inside each of the internment lodges using the Pack of Incendiary Bombs given to you by Erozion.
Speak to Thrall in the basement prison of Durnholde Keep when you have the Internment Lodges Set Ablaze.
Taretha was integral in Thrall's survival and upbringing and instrumental in shaping Thrall's life.
It was Taretha who created the original diversion at Durnholde, allowing Thrall to escape.
Now the Infinite have captured Taretha and hold her at Tarren Mill. The diversion will not happen without our involvement. You must use the incendiary devices that I give you and burn down the internment lodges in Durnholde. When you have done this, speak with young Thrall in the basement prison of Durnholde.