Description
Though elves lack the ability to procreate within their own species, they are capable of breeding with humans, resulting in offspring with superficially elvish characteristics - skinny, pointy ears, a tendency to giggle and burn easily in the sun - but fundamentally human traits i.e. empathy. As mentioned above, creatures from the elves' universe often go hunting when they manage to enter a 'real' universe, one of the things they hunt being people. Elves have no proper imagination or real emotions, and therefore such things fascinate them. Because they cannot create they steal musicians and artists. Because they cannot have children they steal children from the Disc to be their toys. Because they cannot feel empathy they enjoy the suffering of others. In Lords and Ladies, Pratchett states that elves would smash the world if they thought it would make a pretty sound. Pratchett also compares the elves to cats, both being extremely stylish and excessively cruel.
Even if an elf is, for reasons of its own, trying to be nice, its lack of understanding of humans means that there is always something "off" about it. Mostly they get away with this, due to the illusion-creating glamour they cast. While elves are, as mentioned above, not musical, elfsong is perceived as beautiful by humans, and is highly hypnotic. When the Queen of Lancre, Magrat Garlick is released from its hypnotic effects, she realises that elven music really sounds like a saw being played. Elves are generally seen as innately beautiful and stylish, but this is just another aspect of the glamour. Some of them are only vaguely humanoid.
The glamour does not seem to have as much effect on trolls and dwarfs, partly because they lack the romantic imagination to let it work and partly because of their connection to iron.
Elves have copper-based, blue-green blood, and are extremely vulnerable to iron. This is partly because there is no way of magicking iron, and partly that they have the ability to detect magnetic fields, and use them to navigate (as pigeons are thought to do) and even sense the thoughts of others from short distances. The presence of iron disrupts this and sends them into a panic. The main gateway to the world of Elves in Lancre is surrounded by several large boulders of naturally magnetised meteoric iron. When there is no iron around they have the absolute confidence of beings who know exactly where they are.
Rational thought and the absence of superstition, which makes the glamour easier to resist, is referred to by Nanny Ogg as "iron in the head".
Read more about this topic: Elves (Discworld)
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