When a Dragon Slayer enters Dragon Force, they effectively turn into a humanoid Dragon, gaining reptilian scales and traits, such as further elongated, and sharper, canines and scale-like patterns on their skin. According to Zero, Dragon Force is the final, most powerful state a Dragon Slayer can attain; granting them power comparable to that which a real Dragon possesses: the power to utterly destroy everything.
Dragon Force greatly increases the damage done by standard Dragon Slayer spells, and grants the user access to more advanced, powerful attacks. It also drastically enhances the user's physical prowess, speed, and considerably boosts their Magic Power, which becomes visible, taking the appearance of a Dragon. When exuded at its fullest, said Magic Power takes on a violent corporeality, likely as a result of the immense amount of Magic Power employed. When Natsu Dragneel entered this state through the use of Jellal Fernandes' Flame of Rebuke, his flames gained the ability to burn off offending Magic, even that of Zero's ultimate attack Genesis Zero.
- For First Generation Dragon Slayers, those who have been taught their Magic by a real Dragon, certain conditions must be met in order to enter Dragon Force: the only one known so far would be to eat substances with powerful magical properties, preferably those somehow related to the element they can control and consume; while other, unrelated substances can be eaten as well, these have been described as being similar to "poison" for the user, causing heavy after effects, such as pain on activation and extreme exhaustion after use. Natsu Dragneel, the only First Generation Dragon Slayer, have entered Dragon Force, initially requiring an external catalyst to do so. This occurred on two occasions: Natsu's first through the consumption of Etherion, and then from Jellal Fernandes' Flame of Rebuke. Later, Natsu was the first First Generation Dragon Slayer to enter the state without an outside stimulus.
- For Third Generation Dragon Slayers, those who have not only been taught by a Dragon but also have Dragon Lacrima implanted into their body, are capable of freely entering Dragon Force. However, the appearance of their Dragon Force is slightly different from the previous generations, for instead of actual scales, a scale-like design appears on their face and body.