Felstone Field is located in northwestern Western Plaguelands. Originally the area had been a life-sustaining farm, but it was overrun by the vile Scourge. In their quest to destroy the living, they placed a large cauldron in the middle of the field which constantly spews disease-filled vapors into the air. The cauldron itself was protected by Cauldron Lord Bilemaw, Skeletal Sorcerers, Skeletal Flayers and Slavering Ghouls.
A Scarlet Crusader party was also detected in Felstone and would destroy both players and Scourge with equal vengeance.
Inside the house in the north eastern corner of the field was a friendly NPC, Janice Felstone, who offered a quest.
This section concerns content exclusive to Cataclysm.
The area is phased when you enter it, to show Alliance Laborers, the default phasing is not to have any NPCs there.
During the Better Late Than Never quest chain, Horde players are told by Jeremiah Payson that he received the deed to Felstone Field from his sister, Janice Felstone. Alliance players are told by Ol' Emma that she received the deed to the field from her sister, Janice Felstone. Whether there are in fact two deeds to Felstone Field or whether there is some other confusion is unclear.