Two Red Sinister Eyes

Klaus's Void Piercing Needle had been on a killing spree ever since the Monster Devil died. As soon as the big one fell, the smaller ones swarmed him. 

But with his Spirit Eye still active, he could see exactly where they were. He controlled the needle, sending it out to kill them with precision.

Thanks to his recent level-up, his stamina had been fully restored. Now, he was fighting like a man with nothing to lose, swiftly dispatching the lesser monsters. He moved towards the fallen Devil Tiger and stopped beside its massive corpse.

"So this is what an Elemental Core looks like," Klaus muttered, picking up a red crystal-shaped core radiating intense heat. He studied it for a moment before storing it away in his ring.

"Good job, kid," the senior's voice echoed from his soul sea. "But don't be stupid next time. If you think you can take on a Devil without using your active abilities, you're fooling yourself."