Fae Language & Lifespan
The Fae are not vocal by nature and some never speak though they can learn. They rely mostly on a telepathic sending of concepts and feelings as opposed to words, though simple words can be sent. Almost image like in quality, message are much easier to convey and much harder to lie with, giving way to the thought that Fae cannot lie. This also happens to be where Fae madness comes from. Fae language has no name and is entirely incomprehensible to humans and only marginally comprehensible to monsters. Humans who hear it often think they are seeing things and voices when it is often just Fae trying to speak to them. Monsters tend to mirror the vague feelings they get which can be helpful or cause more problems. Fae are literal magic and intrinsically tied with their legends. So long as their legends runs strong they can live forever, however, this also means they are weak against whatever their legends say they are weak to (ie, iron, salt, stake through the heart, etc). The possibility for them to be both immortal and invulnerable is very real, especially given WAPs ever changing environment.