The Eco Core is a Precursor Artifact which is situated at the Abandoned Research Rig. The Eco Core is only featured in the The Lost Frontier. As told by Duke Skyheed, the Eco Core is the famed and mythical source from which all Eco flows. When the world begins to run out of Eco, Jak, Daxter, and Keira travel to the The Brink to find a solution to the problem. When they later meet Duke Skyheed, he reveals that they would need the Eco Seeker which is said to point to any major Eco source. After Jak, Daxter, and Keira fix the Eco Seeker, the Eco Seeker directs them to the Abandoned Research Rig (which was built over Precursor Formations). When they arrive at the Eco Core, Duke Skyheed reveals his plan. Keira activates the Eco Core which results in Klout's death. Later on the ACS Behemoth Skyheed begins to steal the Eco energy from the Eco Core however, Captain Phoenix sacrifices himself in order to stop Skyheed from draining the Eco Core. When the Behemoth is finally destroyed with Duke Skyheed, all of the Eco returns to the Eco Core making it balanced again. Keira then activates the Eco Core and the Core channels energy which travels to Eco Vents around the world ending the Eco shortage and reduces storm and quake activity in all directions.
It also resembles the Dark Eco Silo from Jak and Daxter: The Precursor Legacy.