It is used by the creature casting its hand forwards (or placing its leg forwards if it has no hands, or lurching forwards if it's an armless slug) and screaming, upon which bluish-white energy hits the target and encases it in a block of ice. This results in the target being frozen in place, where it can neither escape from attacks nor fight back against any opponents. Normally, the attack only works on creatures and does not cause them any direct harm, but epic creatures outfitted with an Icy Band can use the attack against buildings and vehicles to deal 30 HP damage (at 100% attack power).
Along with the Hypnomelder and Swarm Magnet, the Icy Band can be used to prevent an opponent from attacking the player. However, unlike the Hypnomelder's Mind Meld, the effect wears off before the attack recharges, and unlike the Swarm Magnet's Summon Swarm, it does not directly cause the opponent damage.