It's fascinating how life works, isn't it? One small action today could trigger a series of unpredictable chains of events, leading to a cascade of chaotic consequences, much like a line of falling dominoes.
That, ladies and gentlemen, is what we call 'The Domino Effect'.
Persephone and Cooper discover that the situation they're in is tied to the former God of Death, Dhuum, and His attempt at escaping imprisonment in the Underworld once again.