When Zac and Curtis cleared their way to the top floor of the mall, the pair felt the air getting chilly to the point where they could see their breath.
A large source of necrotic energy could be felt coming from a clothing shop, and even when they had their talismans, the air was heavy and hard to transverse.
Curtis stood still for a moment as he tried to inspect the necrotic energy, but Zac continued walking towards the clothing store with his baseball bat in hand.
Inside the store, a few brainless zombies wandered around with no apparent objective. However, near the cashier's desk, the pair could see a large teal orb glowing and producing strands of shadows.
"A necrotic core?" Zac pondered aloud.
The redhead hadn't seen a core from up close. The only time he even heard about them was during his mission in the Alanigan Mountains, and that core ended up being destroyed by Sami.