Eldritch energy
From Jenny Everywhere Wiki
“Eldritch energy” was exuded by some eldritch beings, including the Embodiments of the Void. Shape-children like Tiny Thymon could only mature by taking in eldritch energy emitted by their elder of the same concept, in Tiny's case the adult Lord Thymon. If starved of eldritch energy, the shape-child was at risk of vanishing altogether after a certain amount of time. (PROSE: A Copper-Colored Christmas Carol)
