Camp Jupiter, California

They met by the aqueduct, which had somehow survived the battle so far. Polybotes fixed that. He swiped his trident and smashed the nearest brick arch, unleashing a waterfall.

"Go on, then, son of Neptune!" Polybotes taunted. "Let me see your power! Does water do your bidding? Does it heal you? But I am born to oppose Neptune."

The giant thrust his hand under the water. As the torrent passed through his fingers, it turned dark green. He flung some at Percy, who instinctively deflected it with his will. The liquid splattered the ground in front of him. With a nasty hiss, the grass withered and smoked. Whatever that was, Percy doubted the mark of Achilles would protect him from it.

"My touch turns water to poison," Polybotes said. "Let's see what it does to your blood!"

He threw his net at Percy, but Percy rolled out of the way. He diverted the waterfall straight into the giant's face. While Polybotes was blinded, Percy charged. He plunged Riptide into the giant's belly, then withdrew it and vaulted away, leaving the giant roaring in pain.

The strike would have dissolved any lesser monster, but Polybotes just staggered and looked down at the golden ichor—the blood of immortals—spilling from his wound. The cut was already closing.

"Good try, demigod," he snarled. "But I will break you still."

"Gotta catch me first," Percy said.

He turned and bolted toward the city.

"What?" the giant yelled incredulously. "You run, coward? Stand still and die!"

Percy had no intention of doing that. He knew he couldn't kill Polybotes alone. But he did have a plan.

He passed Mrs. O'Leary, who looked up curiously with a gorgon wriggling in her mouth.

"I'm fine!" Percy yelled as he ran by, followed by a giant screaming bloody murder.

He jumped over a burning scorpion and ducked as Hannibal threw a Cyclops across his path. Out of the corner of his eye, he saw Tyson pounding the Earthborn into the ground like a game of whack-a-mole. Ella was fluttering above him, dodging missiles and calling out advice: "The groin. The Earthborn's groin is sensitive."

SMASH!

"Good. Yes. Tyson found its groin."

"Percy needs help?" Tyson called.

"I'm good!"

"Die!" Polybotes yelled, closing fast. Percy kept running.

In the distance, he saw Hazel and Arion galloping across the battlefield, cutting down centaurs and karpoi. One grain spirit yelled, "Wheat! I'll give you wheat!" but Arion stomped him into a pile of breakfast cereal. Queen Hylla and Reyna joined forces, forklift and pegasus riding together, scattering the dark shades of fallen warriors. Frank turned himself into an elephant and stomped through some Cyclopes, and Dakota held the golden eagle high, blasting lightning at any monsters that dared to challenge the Fifth Cohort.

All that was great, but Percy needed a different kind of help. He needed a god.

He glanced back and saw the giant almost within arm's reach. The giant swiped his trident and the points bounced off Percy's armor, sending him stumbling forward. To buy some time, Percy ducked behind one of the aqueduct's columns. The giant swung his trident. When the column crumbled, Percy used the unleashed water to guide the collapse—bringing down several tons of bricks on the giant's head.

Percy bolted for the city limits.

"Terminus!" he yelled.

The nearest statue of the god was about sixty feet ahead. His stone eyes snapped open as Percy ran toward him.

"Completely unacceptable!" he complained. "Buildings on fire! Invaders! Get them out of here, Percy Jackson!"

"I'm trying," he said. "But there's this giant, Polybotes."

"Yes, I know! Wait—Excuse me a moment." Terminus closed his eyes in concentration. A flaming green cannonball sailed overhead and suddenly vaporized. "I can't stop all the missiles," Terminus complained. "Why can't they be civilized and attack more slowly? I'm only one god."

"Help me kill the giant," Percy said, "and this will all be over. A god and a demigod working together—that's the only way to kill him."

Terminus sniffed. "I guard borders. I don't kill giants. It's not in my job description."

"Terminus, come on!" Percy took another step forward, and the god shrieked indignantly.

"Stop right there, young man! No weapons inside the Pomerian Line!"

"But we're under attack."

"I don't care! Rules are rules. When people don't follow the rules, I get very, very angry."

Percy smiled. "Hold that thought."

He sprinted back toward the giant. "Hey, ugly!"

"Rarrr!" Polybotes burst from the ruins of the aqueduct. The water was still pouring over him, turning to poison and creating a steaming marsh around his feet.

"You . . . you will die slowly," the giant promised. He picked up his trident, now dripping with green poison.

All around them, the battle was winding down. As the last monsters were mopped up, Percy's friends started gathering, forming a ring around the giant.

"I will take you prisoner, Percy Jackson," Polybotes snarled. "I will torture you under the sea. Every day the water will heal you, and every day I will bring you closer to death."

"Great offer," Percy said. "But I think I'll just kill you instead."

Polybotes bellowed in rage. He shook his head, and more basilisks flew from his hair.

"Get back!" Frank warned.

Fresh chaos spread through the ranks. Hazel spurred Arion and put herself between the basilisks and the campers. Frank changed form—shrinking into something lean and furry . . . a weasel? Percy thought Frank had lost his mind, but when Frank charged the basilisks, they absolutely freaked out. They slithered away with Frank chasing after them in hot weasely pursuit.

Polybotes pointed his trident and ran toward Percy. As the giant reached the Pomerian Line, Percy jumped aside like a bullfighter. Polybotes barreled across the city limits.

"THAT'S IT!" Terminus cried. "That's AGAINST THE RULES!"

Polybotes frowned, obviously confused that he was being told off by a statue. "What are you?" he growled. "Shut up!"

He pushed the statue over and turned back to Percy, lunging forward and swiping so fast Percy only had time to jump backward. Polybotes' trident still managed to rip through the straps of Percy's armor, and the armor clattered to the ground. Even with the armor on earlier, his clothes had been torn to shreds during the battle. That was the other thing about the mark of Achilles—fewer injuries, but a lot more clothes shopping.

"Now I'm MAD!" Terminus shrieked. "I'm strangling you. Feel that? Those are my hands around your neck, you big bully. Get over here! I'm going to head-butt you so hard—"

"Enough!" The giant stepped on the statue and broke Terminus in three pieces—pedestal, body, and head.

"You DIDN'T!" shouted Terminus. "Percy Jackson, you've got yourself a deal! Let's kill this upstart."

The giant laughed so hard that he didn't realize Percy was charging until it was too late. Percy jumped up, vaulting off the giant's knee, and drove Riptide straight through one of the metal mouths on Polybotes' breastplate, sinking the Celestial bronze hilt-deep in his chest. The giant stumbled backward, tripping over Terminus' pedestal and crashing to the ground. While he was trying to get up, clawing at the sword in his chest, Percy hefted the head of the statue.

"You'll never win!" the giant groaned. "You cannot defeat me alone."

"I'm not alone." Percy raised the stone head above the giant's face. "I'd like you to meet my friend Terminus. He's a god!"

Too late, awareness and fear dawned in the giant's face. Percy smashed the god's head as hard as he could into Polybotes' nose, and the giant dissolved, crumbling into a steaming heap of seaweed, reptile skin, and poisonous muck.

Percy staggered away, completely exhausted. It felt like he'd been fighting nonstop for the past week. He remembered Chiron telling him how Achilles was sleeping if he wasn't fighting. Percy thought back to his youth whenever his mom tried to put him down for a nap and he resisted. He would give anything to be back in that kid's shoes right now.

"Ha!" said the head of Terminus. "That will teach him to obey the rules of Rome."

For a moment, the battlefield was silent except for a few fires burning, and a few retreating monsters screaming in panic.

A ragged circle of Romans and Amazons stood around Percy. Tyson, Ella, and Mrs. O'Leary were there. Frank and Hazel were grinning at him with pride. Arion was nibbling contentedly on a golden shield.

The Romans began to chant, "Percy! Percy!"

They mobbed him. Before he knew it, they were raising him on a shield. The cry changed to, "Praetor! Praetor!"

Among the chanters was Reyna herself, who held up her hand and grasped Percy's in congratulation. He spotted Octavian in the back, glaring, and grinned at him. Percy wasn't one to gloat, but after everything Octavian had done and was willing to do, he didn't mind taking some pleasure in thwarting his plan to become praetor. At least this way, Percy didn't have to threaten him directly and make him a true enemy.

The mob of cheering Romans carried Percy around the Pomerian Line, carefully avoiding Terminus' borders, and escorted him back home to Camp Jupiter, where he really needed a nap. And some new clothes.