Grand Apothecary Putress is the head of the Royal Apothecary Society of the Forsaken. He has played a vital role in the development of the 'New Plague' the Forsaken sought to create.
In Wrath of the Lich King
In Wrath of the Lich King, the apothecaries have managed to create a new plague that not only affects living creatures but also causes fatal damage to undead beings. Putress is revealed to have sided with Varimathras, right hand of Sylvanas. Together they stage a coup to take over the Undercity, the capital of the Forsaken.
In addition, Putress is sent to Northrend to unleash the newly developed plague upon those fighting at Angrathar: The Wrath Gate.