Imperial Gold Onager

	The nearest onager was a hundred yards downhill, encircled in spiked trenches and guarded by a dozen demigods. The machine was primed, ready to fire. Its huge sling cupped a projectile the size of a Honda Civic, glowing with flecks of gold.
	With icy certainty, Nico realized what Octavian was up to. The projectile was a mixture of incendiaries and Imperial gold. Even a small amount of Imperial gold could be incredibly volatile. Exposed to too much heat or pressure, the stuff would explode with devastating impact, and of course it was deadly to demigods as well as monsters. If that onager scored a hit on Camp Half-Blood, anything in the blast zone would be annihilated – vaporized by the heat, or disintegrated by the shrapnel. And the Romans had six onagers, all stocked with piles of ammunition.