Essence of Aether is the last Tier 3 mission for Act 2 in Modern Warfare 3 Zombies. Jansen tasks you with the objective of getting Essence samples from three different areas in Urzikstan, including the Quadri Shopping Center.
Quadri Shopping Center Location in Modern Warfare 3 Zombies
The Quadri Shopping Center is located in the western section of Zaravan City, a POI in the southwestern part of the map. On the map above, I have marked the shop you need to visit in Quadri Shopping Center to collect the quest item for the Essence of Aether mission.
The shop is a small food joint named Cargrill; you'll find the Essence container you're looking for on the counter next to the cash register. Approach the container, and you'll get the prompt to Collect Essence Sample if you have the mission activated.
Quadri Shopping Center covers a large chunk of the city, and you'll find low-level Zombies because it's a Tier 1 threat zone. I also encountered a mercenary convoy here, so beware of those NPCs, as they have guns, unlike the undead. Once your work is done, you can go for the other samples or explore the area for some good loot and wallbuy weapons.
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