He tapped the arrow keys. The marine’s footsteps were heavy, a clank of armor plates and boots on steel. Leo rounded the first corner. The two former humans—zombiemen—shambled into view, their backs turned.

He lowered the shotgun. He walked past it, opened the blue door, and stepped onto the exit elevator.

The moment the level loaded, he knew. The usual PRBoom start was a quiet, almost meditative affair: the hum of the reactor, the distant growl of an imp. Now, the air itself felt thick. The iconic drum-and-bass midi was there, but underneath it, he could hear a low, wet thrumming. A heartbeat.

“Okay,” Leo whispered. “That’s… new.”