Gate

A term from Kamen Rider Wizard

Used to describe people with high levels of magic. If such people give into despair, the mass of magic within them would come alive and become beings known as Phantom.

Spoiler warning: Significant plot details follow.

List of Gates

Daimon Rinko Ep. 1
Souma Haruto Ep. 2 (Flashback)
Koyomi Ep. 2 (Flashback)
Nara Shunpei Ep. 2