In the anime, the earliest record of Demon Tool being created were from the likes of Eibon, the Greatest Sorcerer and Inventor of all time. Having begun development into the Demon Tools, his original goal was to produce tools in which would benefit not only mankind but the world order.
In the anime, Death explained that the Demon Tools were originally created for the benefit of mankind and the preservation of the world's order. However, as time passed by, the powerful capabilities of Demon Tools became known. The more good it can do, the more tempted were evil forces to utilize it for malicious and destructive purposes. While factions like DWMA uses Demon Tools for transportation, gadgetry, and even perhaps battle, their usage differs from Arachnophobia, in which is more battle oriented, destructive, and malicious.
Demon Tool Soldiers
List of Demon Tools
Main article: Category:Demon Tool