Daemons are fictional creatures from Philip Pullman’s His Dark Materials fantasy series. They are external representations of the soul, and are inextricably linked to a single person, with whom they share an immensely intimate bond.

In the mythos of the books, an equivalent for daemons appears to exist for all sentient creatures and in all universes, although their forms may differ wildly. The daemons most discussed in the books are animal familiars associated with people in Lyra’s universe. These daemons may take on various animal shapes while their human companion is still a child, but once the child grows up they settle on one form, which is representative of a range of character traits the human possesses.

Daemons are generally of the opposite sex from their human counterpart, though this is not always the case. It has been suggested that a human having a same-sexed daemon might indicate homosexuality, or might indicate some sort of supernatural power. Daemons also have their own names, given to them by the daemons of the human parents, and their own distinct personalities. Daemons may often give advice to their human companion, so are certainly of their own mind. Some daemons may be more cowardly than their human, others may be more brave, some may be very wise, while others may act as a sort of conscience.

Daemons cannot move too far away from their human companion, otherwise the human begins to feel severe discomfort. If they continue being pulled away, ultimately death will result. In some cases this can limit the movements of the human, such as for a sailor whose daemon settles in the form of a dolphin, and therefore must always be in the water.

In the books, the energy linking a daemon with his or her human companion appears to be immense. When the bond is severed, as by a sort of guillotine used by the General Oblation Board or Lord Asriel, incredible energy is released which can be harnessed. Once severed from their daemons, however, people lose most of their will, effectively becoming zombies. Although the General Oblation Board appears to be the first group in Europe to experiment with such things, it is implied throughout the books that such practices have existed for many years in parts of Africa.

Other sentient beings also have corollaries to daemons, although theirs may differ drastically from those humans have. The witches, for example, who seem to be nearly human, have animal daemons similar to humans. Their daemons appear to be mostly in bird form, and are able to travel hundreds of miles away from their witch without any discomfort being felt, in stark contrast to humans and their short tether. The panserbjørne appear to use their armour as their daemons, as it is the source of their strength.

In other universes daemons may or may not be visible, but they still exist one way or the other. In our universe, for example, it is implied that the daemon is still there, but that we have not learned to see it or express it. In the universe of the mulefa, it appears that the pods they ride upon are their daemons, tying them intimately to the Dust. There is some suggestion that in some universes a person’s Death, which follows them around at all times until their time to die comes, may act as a daemon, but it is uncertain.

Touching another person’s daemon in Lyra’s world is considered the strictest taboo. Although a lover may touch another’s daemon if invited, outside of this circumstance it is virtually unheard of. Even in battle, soldiers will avoid touching enemy daemons out of respect. Daemons, however, may touch one another freely, and may do battle in order to play out a struggle between their two human companions.