Percy stared at his jelly donut. He had a rocky history with Nico di Angelo. The guy had once tricked him into visiting Hades's palace, and Percy had ended up in a cell. But most of the time, Nico sided with the good guys. He certainly didn't deserve slow suffocation in a bronze jar, and Percy couldn't stand seeing Hazel in pain."We'll rescue him," he promised her. "We have to. The prophecy says he holds the key to endless death.
Rick Riordan, The Mark of Athena
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