Chaos infusion

a term from a game

Chaos Infusions (called Cie in the Japanese version) is a term from Lightning Returns: Final Fantasy XIII. According to the game's creators, Chaos Infusions are places where Chaos energy gathers in thick clouds in random locations throughout Nova Chrysalia. Where the outbursts occur, powerful monsters appear that gift the player with special items upon defeat.

Story
A Chaos Infusion is seen in the E3 2013 demo, when Lightning chases Snow into the heart of the Yusnaan palace, encountering Lumina at the heart of the Infusion and needing to fight a Zaltys summoned by her.