How to find all Serum items in Black Ops 7 Zombies Ashes of Damned – Yuri’s Lab code quest

Completing the main Easter Egg in Ashes of the Damned is a true challenge in Black Ops 7 Zombies, and getting all the Serum items can be quite tricky.

The Serum items are an assorted set of different body parts you first need to find. Then, you’ll have to use the items to decode a code at Yuri’s Lab, which will be revealed on the chalkboard.

How to collect all Serum items in Black Ops 7 Zombies Ashes of the Damned

There are seven different items to find related to the Yuri’s Lab code quest. Here’s a quick rundown about how to find all of them. All seven items are relatively straightforward as long as you know what to do.

• Hoard Chunks: For this part, you’ll need to get the Abomination Heads Hood upgrade for Ol’Tessie. Once done, use the beam to shoot down any Purple Aether Flora when you travel between any two locations. You’ll manage to get Hoard Chunks from them, along with salvage.
• Mysterious Limb: Once the Zursa spawns on the map, use Ol’Tessie’s beam attack to kill it. It will leave you with a Mysterious Limb.
• Fungi: Go inside the main Cabin at Blackwater Lake, and you’ll find a Jar of Spores. You won’t be able to see the jar (might be a result of a bug), but it’s in the sink on the southern wall of the kitchen. If you can’t see the jar, just interact with the top right-hand corner of the sink, and keep checking your inventory. Put the jar on a dead horse on the road in front of Vandorn Farm, and wait three rounds for the mushroom to grow.
• Ravager Eyes: You’ll have to put a Ravager through a saw trap to get its eyes. You can find a Saw Trap at Exit 115. Just activate it when there are Ravagers around you, and the first one will drop the eyes when killed.
• Foot: There are a couple of hanging corpses on the main entrance of Vandorn Farm. Use a Tomahawk on any of them to get the Corpse’s Foot.
• Powder: Head to Ashwood, where the mirror is located. Use a Wisp to activate the mirror, and then smash it with the Necrofluid Gauntlet to obtain the powder.
• Syringe: The syringe is located on the shelf inside the radio room in Zarya Cosmodrome.

How to use the Serum items in Black Ops 7 Zombies Ashes of the Damned

Once you have all the items, head over to Yuri’s Lab in the Arya Cosmodrome location. You’ll find a smoking flash and a cypher on the wall. Wait for the smoke to turn grey before entering the ingredients in the correct order. Here’s a list of symbols and their corresponding ingredients.

• CL – Ravager Eyes
• L and reverse L – Mysterious Limb
• C< – Fungi
• LC – Hoard Chumks
• >J – Foot

Use the first two letters from the code to understand which ingredients you have to input. If done correctly, the flask will ask you for your blood, triggering a lockdown sequence. Select the ingredients based on the code as shown on the chalkboard (by sticking to the first two letters).