Devil Trigger (often abbreviated as DT) is a special technique possessed by demons and half-demons which allows them to release their full power. While in Devil Trigger, the user will assume their true form. In this form, many of the character's attributes are amplified, and the character may have access to upgrades or even additions to their normal abilities like flying or hovering. When playing on higher difficulties, enemies can enter a Devil Trigger-like state after a certain time limit (which is fixed for each enemy). This causes enemies to strengthen their attributes as well as making them attack more often and more powerfully.
While in Devil Trigger, the characters' speed and strength increase, and they constantly recuperate vitality. Additional effects are apparent, though these vary between games, and are usually determined by the equipped weapons or items of the character. For example, Dante will usually gain the ability to hover while in Devil Trigger, but this is obtained by equipping the Alastor in Devil May Cry, the Aerial Heart in Devil May Cry 2, and Nevan in Devil May Cry 3.
Devil Trigger is confirmed to be available to Dante, Sparda, Lucia, Trish, Vergil and Nero. Several other characters, specifically Arkham, Credo, Agnus and Sanctus have abilities resembling Devil Trigger, though it is not known if it is the same.