Kronos - Collaspes Magic Barrier

Hades drew his sword, a double-edged Stygian blade etched with silver. “Now fight me! For today the House of Hades will be called the saviors of Olympus.”
“I don’t have time for this,” Kronos snarled.
He struck the ground with his scythe. A crack spread in both directions, circling the Empire State Building. A wall of force shimmered along the fissure line, separating Kronos’s vanguard, my friends, and me from the bulk of the two armies.
“What’s he doing?” I muttered.
“Sealing us in,” Thalia said. “He’s collapsing the magic barriers around Manhattan—cutting off just the building, and us.”
Sure enough, outside the barrier, car engines revved to life. Pedestrians woke up and stared uncomprehendingly at the monsters and zombies all around them. No telling what they saw through the Mist, but I’m sure it was plenty scary. Car doors opened. And at the end of the block, Paul Blofis and my mom got out of their Prius.
“No,” I said. “Don’t . . .”
My mother could see through the Mist. I could tell from her expression that she understood how serious things were. I hoped she would have the sense to run. But she locked eyes with me, said something to Paul, and they ran straight toward us.
I couldn’t call out. The last thing I wanted to do was bring her to Kronos’s attention.
Fortunately, Hades caused a distraction. He charged at the wall of force, but his chariot crashed against it and overturned. He got to his feet, cursing, and blasted the wall with black energy. The barrier held.
“ATTACK!” he roared.

***

The Last Olympian, Chapter 18