Jak & Daxter: The Lost Levels

In a world shaped by ancient Precursor ruins and leftover machinery, two boys from the southern continent sneak off to Misty Island against orders. There they witness a shadowy old man and a mysterious woman rallying Lurkers toward a dangerous source of power — eco. During their escape, Daxter tumbles into a pool of dark eco and emerges transformed into an ottsel. Reversing the change means reaching a wise sage far to the north, and getting there requires Kiera's help — which first means gathering eight power cells.