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The Perfect Devil Trigger is an unused devil form that was originally set to appear in Devil May Cry 4, but the possibility of that was dubbed as impractical. It appears to be a second or ascended form of Dante's normal Devil Trigger, in which his power increases exponentially.
According to the information translated from the Art Book, the Perfect Devil Trigger's power far surpasses that of his father, the Dark Knight Sparda. This, in turn, causes Dante to be seemingly all-powerful and nearly impossible to defeat. However, this form is dangerous, due to the fact that Dante will eventually lose his humanity and become a feral being.
The illustration depicts it having wings, which indicates that Dante possesses the power of flight. His tail resembles his trademark sword, Rebellion, which also becomes a part of his form. No other abilities have been described, but it is possible that the form serves a similar function as Dante's Majin Form, yet even greater in terms of power and with various other abilities in its arsenal.
- In the art book it is revealed that Nero was originally set to have a Perfect Devil Trigger as well; it was meant to be seen as his complete devil form, replacing his spectral Devil Trigger and allowing him to more evenly match Dante. Both of these Devil Triggers have yet to appear in the series.