Codex — Starcraft

Inception: The following text is not sanctioned by the Umojan Protectorate, the Daelaam, or the Swarm. It is a psychoactive echo recovered from a xel'naga temple-ship adrift in the Silent Currents.

He created the Hybrids not as perfect beings, but as parodies of humanity. Look closely at a Hybrid. It has the form of a Protoss. The essence of a Zerg. But its eyes—empty, obedient, hollow—lack the one thing humans carry like a curse: starcraft codex

That chain became the human germline .