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Step 1: Kill mannequins around the APD Control area to fill up the empty soul canister. Once full, the door of the APD will open, revealing the Avogadro.
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Step 2: Once the Nuke has landed, leave the APD Control area and find the backup soul canisters around the bunker, located in the following areas: Beds, Storage, Diner and Lounge. When you find a canister you must have every player in your game go in that area and have 1 person interact with the canister to allow it to be filled with souls, by killing A.D.A.M. Units. While you are attempting to fill the canisters the Avogadro will attack you. Once you have filled it with enough souls you will hear a quote and electricity will fill that room, blocking you access to it.
- Step 3: Once all 4 canisters have been filled head back to APD Control and shooting the Avogadro will make him move in the direction you are shooting. You must shoot him so that he gets in front of the APD door. Once he is in front he will be sucked into the APD. After all the audio quotes from the facility overseer the APD door will open and you are able to obtain the Elemental Shard. When you obtain the shard the cutscene will play and your game will end.