Polarity Field is a ability of the Spy class. It has 60 meters range.
"Creates a field around the targeted enemy that performs a quantum inversion of energy packets that cross its barrier. The inverted energy is able to easily bypass the target's defense systems. This has the effect of transforming the target's defenses into vulnerabilities."
Polarity Field turns its target's damage resistances into vulnerabilites, causing them to take more damage of that type. However, it cannot remove immunities. Polarity Field debuff lasts for 1 minute.