Top Definition
An elite group of fictional warriors (from the City of Bones books)
Trained since childhood to fight and slay the downworlders, demons and faeries that attempt to create havoc on earth.

Shadowhunters are different from humans which they call "mundanes", the Shadowhunters are what you could call an enhanced race of humans

Shadowhunters are physically marked with Runes over their skin, the older or more elite a Shadowhunter, the more Runes they will have

The Runes create different types of effects, some are defensive and some aid strength etc.
these Runes are tattooed onto the Shadowhunter using a Stele (a specially crafted Shadowhunter weapon)

Its a really cool concept so go read Cassandra Clare's books:
City of Bones
City of Ashes &
City of Glass
And Yes, I do have way too much time on my hands :)
"It means 'Shadowhunters: Looking Better in Black Than the Widows of our Enemies Since 1234.'" -- Jace Wayland (a Shadowhunter from the City of Bones books)
by Skins4Love June 17, 2009
Kickass demon-killers from Cassandra Clare's series: Infernal Devices and the Mortal Instruments.

These demon-killers protect all mundanes (humans) from evil demons who want to wreck havoc in the world.
-Did you see me kick that demon's ass?
-Damn, dude, your one out of the group of Shadowhunters I know that would do THAT to a demon.
by Lurien February 23, 2011
Shadowhunters are humans who protect and govern the mundanes and downworlders in Cassandra Clare's The Mortal Instruments and Infernal Devices.

Shadowhunters are humans who are born with the blood of the Angel Raziel. They 'control' the shadow world and those who live in it e.g. downworlders (warlocks, fairies, vampires, werewolves)and demons. Their mandate is to keep the peace in the Shadow World and keep it hidden from the mundane world while protecting the inhabitants of both worlds.

Shadowhunters despite having the blood of the Angel, are mortal and therefore vulnerable to old age and death; however, their angelic blood gives them special abilities (that mundanes do not posses)that allow them to slay demons and have somewhat special powers through runes.
"We are sometimes called the Nephilim. In the Bible they were the offspring of humans and angels."
Hodge Starkweather

“It means 'Shadowhunters: Looking Better in BlackThan the Widows of our Enemies Since 1234" - Jace Herondale
via giphy
by Nevertrustaduck November 02, 2015
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