" A fae bereft of Underhill is a weak fae indeed,” she said. “Weaker and weaker over the months, the years, the decades, until their magic is but a memory. For Underhill replenishes our connection to its energy and essence. This is her power. And Rubezahl knows it well. The fae on Earth have been cut off from Underhill long enough that they will soon begin to pay the price. That soon they will become a foothold for this darker, more sinister power. "

― Shannon Mayer , A Crown of Petals and Ice (Honey and Ice Trilogy, #3)