There are two factions for the spawns at the WC Druid Rings. Theres a few different npcs that can spawn there so it can be 2 Druids or 1 Druid, 1 Ranger
Surefall Glade Druids -
Jaggedpine Treefolk
Surefall Glade Rangers -
Protectors of Pine
Jaggedpine is easy to fix, can kill those unkempt druids or the gnolls in Blackburrow
Protectors of Pine is extremely difficult to fix and they may always be kos
Links above go to the faction pages where you can see what quests/mobs raise or lower each one. NK/EK Rings I believe are only Jaggedpine Treefolk spawns