The effect is noticed by a brief shimmering blue aura around the target. Abilties are frosted over, signifying that those skills do not regain energy for the duration of the Chill. Chilled skills not on cooldown could be executed for that one time, but subsequent turns will not regain energy.
IGOROK's Arctic Assault deals 1.5x damage to Chilled enemies.
Tinkerer's Tricks (Trait): All attacks have a chance to apply one of the following debuffs to each enemy hit: Chilled, Burned, Shocked, Diseased, or Poisoned. Only one of these debuffs will be applied per hit, and is applied to each enemy individually. This means that if you use Helmet Missiles, one enemy could get burned, another could be poisoned, and another might not be debuffed at all (resisted or immune).