The Shadowhunter's Codex
LANGUAGES?
Most common demons cannot speak human languages. A good number of species are, however, able to parrot human speech that they have heard. This is often a sign that a demon has been summoned rather than coming to our world on its own; the demon will be heard to repeat, often obsessively, words and phrases spoken to it by the summoner.
There are a number of demon languages—possibly an infinite number of them—but a number that we have identified and that warlocks and, more rarely, Shadowhunters interested in demon research may learn. The two most common are known to demon philologists as Cthonic and Purgatic. It is worthwhile to at least be able to recognize these two languages in their written and spoken forms, and perhaps to memorize a few frequently used phrases, such as “Hello,” “Good-bye,” “I am a Nephilim,” “In the name of Raziel I abjure thee,” “Begone, fiend,” and so on.
DO DEMONS POSSESS PEOPLE?
Despite the mundane obsession with demons taking possession of their bodies, actual demon possession is very rare and requires a very powerful Greater Demon. This is lucky, because it is one of the most powerful magics that demons possess. Usually the only way the connection between the possessor and the possessed can be broken is by killing the demon, which more often than not kills the hapless mundane victim as well. If you encounter a possession, do not try to handle the situation on your own. Do not try to negotiate with the possessed as if they are political hostages. The possessed are not merely corrupted by demonic influence but are fully controlled. They become like passengers in their own bodies, able to experience everything that the demon is doing but unable to exert any will to act independently at all. (Mercifully, the possessed usually retain no memories of their actions while inhabited.) You may restrain the victim, preferably with help from other Shadowhunters, and then you should contact the Silent Brothers and allow them to remove the subject to the Silent City, where they will perform magics that you are better off not witnessing.
WHY ARE DEMONS SO EAGER TO DESTROY US?
It’s believed that demons have an intrinsic hatred of us as a result of their envy of the life of our dimension. Theirs, as far as we can tell, is a dead dimension, a dimension devoid of life, and they desire to consume us and our world to take that which they themselves do not (or, perhaps, no longer) have. Demons are able to sense the presence of life nearby; in fact, they will often use this sense to track down their prey.
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DID YOU KNOW?
One of the great unsung heroes of the Nephilim is Gregory Hans, a seventeenth-century Silent Brother who discovered the correct combination of Marks to both enhance a Nephilim’s senses and exclude the smell of demons from that enhancement. Generations of Shadowhunters thank him. (Note that under standard demonic glamour, those who are susceptible cannot smell a demon any more than they can hear or see one. All the senses, thankfully, are negated.)
HOW DO WE KILL THEM?
The most important weakness of demons is, of course, their vulnerability to angelic power and heavenly fire. Like the Downworlders they brought into being, they cannot easily be harmed by normal earthly weapons, or at least not permanently harmed. For this reason you will find even the most basic Shadowhunter weapons to be Marked to strengthen them against demons, and you will find the seraph blade (see Treasury, Chapter 1) to be the most important of your tools in combat.
In addition to being repelled by direct seraphic energy, most demons can be warded off with holy symbols of all kinds. Very powerful demons, however, such as Greater Demons, may be caused only discomfort by the presence of holy symbols, rather than actual harm, so a Shadowhunter should not depend exclusively on these symbols to protect themselves.
Like vampires, demons cannot stand the direct force of sunlight upon their bodies. Note

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