Manipulates Misery/Sadness, Supernatural Willpower

"THE IMPACT DIDN’T KILL HER, but the cold nearly did. Freezing water shocked
the air right out of her lungs. Her limbs turned rigid, and she lost her grip
on Percy. She began to sink. Strange wailing sounds filled her ears—millions
of heartbroken voices, as if the river were made of distilled sadness. The voices
were worse than the cold. They weighed her down and made her numb.
	What’s the point of struggling? they told her. You’re dead anyway. You’ll
never leave this place.
	She could sink to the bottom and drown, let the river carry her body away.
That would be easier. She could just close her eyes.…
	Percy gripped her hand and jolted her back to reality. She couldn’t see him
in the murky water, but suddenly she didn’t want to die.
	Together they kicked upward and broke the surface. Annabeth gasped, grateful for
the air, no matter how sulfurous. The water swirled around them, and she realized
Percy was creating a whirlpool to buoy them up.
	Though she couldn’t make out their surroundings, she knew this was a
river. Rivers had shores.
	'Land,' she croaked. 'Go sideways.'

	Percy looked near dead with exhaustion. Usually water reinvigorated him,
but not this water. Controlling it must have taken every bit of his strength. The
whirlpool began to dissipate. Annabeth hooked one arm around his waist and
struggled across the current. The river worked against her: thousands of weeping
voices whispering in her ears, getting inside her brain.
	Life is despair, they said. Everything is pointless, and then you die.
	'Pointless,' Percy murmured. His teeth chattered from the cold. He stopped
swimming and began to sink.
	'Percy!' she shrieked. “The river is messing with your mind. It’s the
Cocytus—the River of Lamentation. It’s made of pure misery!”
	'Misery,' he agreed.
	'Fight it!'
	She kicked and struggled, trying to keep both of them afloat. Another
cosmic joke for Gaea to laugh at: Annabeth dies trying to keep her boyfriend, the
son of Poseidon, from drowning.
	Not going to happen, you hag, Annabeth thought.
	She hugged Percy tighter and kissed him. 'Tell me about New Rome,' she
demanded. 'What were your plans for us?'
	'New Rome…For us…'
	'Yeah, Seaweed Brain. You said we could have a future there! Tell me!”
	Annabeth had never wanted to leave Camp Half-Blood. It was the only real
home she’d ever known. But days ago, on the Argo II, Percy had told her that he
imagined a future for the two of them among the Roman demigods. In their city
of New Rome, veterans of the legion could settle down safely, go to college, get
married, even have kids.
	'Architecture,' Percy murmured. The fog started to clear from his eyes.
'Thought you’d like the houses, the parks. There’s one street with all these cool
fountains.'

	Annabeth started making progress against the current. Her limbs felt like
bags of wet sand, but Percy was helping her now. She could see the dark line of
the shore about a stone’s throw away.
	'College,' she gasped. 'Could we go there together?'
	'Y-yeah,' he agreed, a little more confidently.
	'What would you study, Percy?'
	'Dunno,' he admitted.
	'Marine science,' she suggested. 'Oceanography?'
	'Surfing?' he asked.
	She laughed, and the sound sent a shock wave through the water. The
wailing faded to background noise. Annabeth wondered if anyone had ever
laughed in Tartarus before—just a pure, simple laugh of pleasure. She doubted
it.
	She used the last of her strength to reach the riverbank. Her feet dug into
the sandy bottom. She and Percy hauled themselves ashore, shivering and
gasping, and collapsed on the dark sand.

- House of Hades, Chapter VI (Annabeth), Pg. 34