Just of note the mob at the end of this quest line is 67 ^^^. You can lure friends to come help by mentioning the mob counts as a named and you get AA xp for the kill. You don't want to ***** this up since once you drop the pot in the druid ring for the ritual it's gone, so you only get one shot at the fight (don't know if the mob despawns , but you don't want to risk someone else coming along and snagging it).
Also, when you go to the corrupt druid ring make sure there is a raven sitting on top of the rings. I don't know what (if anything) will be affected if it's not up, but it's the raven that turns into the mob you have to kill.