Dromos is a weapon built from ancient artifacts stolen from the gods by king Charioce XVII. These ancient artifacts existed before man, gods, and demons roamed Mistarcia. It is a weapon of mass destruction and it's power can destroy the balance of the world.
Using Dromos by humans comes at a price. When Charioce used it for the first time it costed his left eye to go blind. When the second time it was used by both Charioce and Nina it costed Charioce right eye to go blind and Nina losing her voice.
Dromos proved to be on par, if not more powerful than Bahamut as it destroyed its body and was easily defeated by Charioce and Nina.
Dromos is activated through the magical green stones placed by the device and Charioce's bracelet.
Dromos can take different shapes such as hand, sword, and dragon depending on who is using and what they are using as a weapon.
Mankind was able to build Dromos by finding a guide in Martinet's book on how to use it, found by the former Steward of the royal family who later on has become onyx task force captain. Both onyx task force captain and the old scientists studied the book and found signs of Bahamut's awakening in Eibos.