Warlocks are the downworlders who have big role in the creation of Shadowhunters. It is a warlock who calls the Angel Raziel in the purpose to create Shadowhunters as the mortal instruments to banish demons. As a downworlder, a warlock is part human and part demon. Warlocks have a special ability to cast spells because they have demon's blood and mundane's blood. Warlocks are immortal creatures. They can live until hundreds years. The warlock who has a great role in the story is Magnus Bane, the high warlock of Brooklyn.