"Light, ice, and water!" Chiaki calls out after watching the effects of their attacks closely. "Those are his weaknesses!"

And in order to help them exploit at least one of those weaknesses, she once again plays the Pac Man Theme, providing the Heroes +50% damage on their light elemental attacks while reducing the damage they take from Chaos' dark elemental attacks by the same amount. And with her second action, she capitalizes on that bonus by sending a Holy spell Chaos' way. She's trusting they have enough healers this time around that they'll be able to bring Tear and Akane back around.