World of Warcraft/The Elemental Equation

Questgiver: Archmage Angela Dosantos at Light's Hope Chapel in the Eastern Plaguelands
Reward: Insignia of the Dawn
Objective: Archmage Angela Dosantos at Light's Hope Chapel in the Eastern Plagelands wants 30 Core of Elements.

Core of Elements drop off many elementals throughout Azeroth. The fastest way to get them in to purchase them from the auction house.