Dark Eco

Dark Eco is a powerful substance in the Jak and Daxter series, and one of the two most powerful types of Eco. Dark Eco is often used by the villains.

Jak and Daxter: The Precursor Legacy
Dark Eco is Gol and Maia's primary source of power. The more intelligent Lurkers are also worshipers of Dark Eco who use it as a weapon.

Daxter
Kaden and his army of Metal Bugs are a type of Metal Head and thus manipulate Dark Eco.

Jak 2: Renegade
In this game Jak is given the power to transform into a more monsterous form named Dark Jak due to being pumped full of Dark Eco. The primary villain Kor and his army of Metal Heads are also great manipulators of Dark Eco.

Jak 3: Wastelander
The most powerful practitioners and controller's of Dark Eco appear, they are named the Dark Makers and are controlled by some unseen overlord. In the game Erol appears as their leader, having gained the ability to manipulate and control Dark Eco.

Jak and Daxter: The Lost Frontier
The Dark Warriors and their leader Duke Skyheed are Aeropan people who have been transformed by Dark Eco. They are the main antagonists.