List of Rules Edit
The first and most important rule is a faerie may not enter any house or, by extension, any dimension without permission from one of its inhabitants.
Faeries cannot break any oath or contract to which they bind themselves.
Faeries must attempt to solve any riddle posed to them.
Faeries cannot cross running water. (This is not universal)
A faerie's weakness is the sound of iron being struck, especially an iron bell or chime. (This is the only rule which does not apply to vampires.)
This is not an exhaustive list. Other rules may apply depending on where the faerie lives, e.g., Never-Neverland.