Starcraft Codex -

This is why the Overmind created Kerrigan. Not as a weapon. As a translator . The Zerg could not understand individuality. The Protoss could not understand chaos. But a human ghost—broken, psychic, angry—could hold both in her ribcage and call it rage .

The error was individuality .

This terrified him.

Archive locked. Key destroyed. The silence is yours now. End of Codex Fragment. starcraft codex

The entity known as “Amon” is dead. His followers claim he was a god of death. They are wrong. He was a symptom. This is why the Overmind created Kerrigan