Kael exhaled. The Mycelium was gone. The price was high: no more updates, no more external inputs. He would have to rebuild the ports by hand.

Then his air-gapped sensor tripped. A silent relay clicked. Someone had physically plugged a rogue device into his external data terminal—the one meant for the courier SSDs.

Inbound connection attempt on port 445. Blocked. Inbound connection attempt on port 3389. Blocked. Inbound connection attempt on port 22. Blocked.

Kael’s workshop was one such island. No Wi-Fi. No Bluetooth. Just copper wire, soldering irons, and a single, humming workstation running a piece of software that looked like a relic from a decade ago: —the On-Premise edition.

No cloud. No updates from a central server. Just a local signature database he curated by hand, updated via courier-delivered SSDs, and a heuristic engine so aggressive it would flag its own system logs as suspicious.

“It’s here,” Kael whispered, his coffee mug freezing halfway to his lips.

His radio crackled. A neighbor, three blocks over. “Kael… it’s in the mesh. It piggybacked on a weather drone. It’s knocking on every port.”