Definition of pipe for English Language Learners. : 1  a long, hollow tube for carrying water, steam, gas, etc. : 2  a tube with a small bowl at one end that is used for smoking tobacco. : 3  a musical instrument that is in the shape of a tube, has holes along the top, and is played by blowing.
The Blood of Olympus (mentioned) Lupa is the immortal Roman wolf goddess who trains Roman demigods in the ways of Rome. She trains the demigods at the Wolf House, then sends them to Camp Jupiter where they can join the Twelfth Legion.
Hecate ~ Goddess of the Witches. Hecate is a powerful goddess representing the aspects of the Triple Goddess: goddess of fertility and plenty; goddess of the moon; and goddess of the night and the underworld, which led to her evolving as the patroness of magic and Witchcraft. She mixed fertility with death to be used as earth power.