That was Hera. Her Majesty, the Loose Cannon.

“No hero is above fear, Percy. And you have risen above every hero.- Poseidon”

“The Death Mist is not for helping!" Akhlys shrieked. "It shrouds mortals in mis…”

“He climbed up behind Hazel. Arion took off across the water, the nymphs screami…”

“At the Feast of Fortune, she'll awaken, and the demigods will be cut down like-…”