Vindicator Aldar is an Alliance-only quest in the draenei starting region Ammen Vale. This quest is not required for File:Alliance 15.png [4] Inoculation, but gives a few extra XP so it is recommended that you get this quest before Inoculation. It appears that you must complete the File:Alliance 15.png [3] Healing the Lake quest chain from Botanist Taerix before she will offer this quest.