Warlocks are a rare class with natural born abilities that go beyond the normal human capabilities. Though most are limited in what they can do, with certain enhancements there is a small chance that their abilities can be increased greatly.
Warlocks are able to use and manipulate dark energy to interact with the world around them, which can include creating protective shields, lift objects, mess with gravity in a limited space and etc. They are known to be incredibly dangerous in a fight, and while they are not invincible, they aren't easy to take down.
Should a PHASe applicant shows any Warlock-like abilities, they are signed up for training under Project Lucifer.