Erogel is a naturally occurring substance produced by fairies that normally protects their wings from being gripped, snagged, or pulled, but also protects their bodies from various environmental effects, and can aid them in seducing newphys. For most fairies, erogel is analogous to the protective oils of other creatures.

Under special training, however, adventurer-fairies can be trained to produce erogel in higher quantities, such that they can use it like ammunition for specialized weapons, or as a component for certain spells.

Newphys that touch erogel, or come into contact via taste, smell, or other senses can find themselves more easily seduced or otherwise brought under a fairy's powers.