Bursting blood vessels

Bob stumbled away from the battle, his saber-toothed cat at his side. Percy gave them as much cover as he could—causing blood vessels in the ground to burst one after the other. Some monsters were vaporized in Styx water. Others got a Cocytus shower and collapsed, weeping hopelessly.
Others were doused with liquid Lethe and stared blankly around them, no longer sure where they were or even who they were.


HoH ch.71