Otis whirlpool

We attack together," he said. "Otis first, because he's weaker. Take him out quickly and move to Ephialtes. Bronze and gold together — maybe that'll keep them from re-forming a little longer."
Jason smiled dryly, like he'd just found out he would die in an embarrassing way.
"Why not?" he agreed. "But Ephialtes isn't going to stand there and wait while we kill his brother.
Unless — "
"Good wind today," Percy offered. "And there're some water pipes running under the arena."

Too late, he tried to stop. The demigods rolled to either side, and Jason summoned the wind, using the giant's own momentum to shove him into the water. As Otis struggled to rise, Percy and Jason attacked as one. They launched themselves at the giant and brought their blades down on Otis's head.
The poor guy didn't even have a chance to pirouette. He exploded into powder on the lake's surface like a huge packet of drink mix.
Percy churned the lake into a whirlpool. Otis's essence tried to re-form, but as his head appeared from the water, Jason called lightning and blasted him to dust again.


MoA ch.48