The wolves snarled in the darkness.

Out of the corner of her eye, Piper saw Leo put up his hammer and slip something else from his tool belt—a glass bottle full of clear liquid.

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But Leo struck first. He threw his glass bottle and it shattered on the ground, splattering liquid all over the wolves—the unmistakable smell of gasoline. He shot a burst of fire at the puddle, and a wall of flames erupted.

Wolves yelped and retreated. Several caught fire and had to run back into the snow. Even Lycaon looked uneasily at the barrier of flames now separating his wolves from the demigods.

The Lost Hero, Chapter XXXIV