The Biothermal Dampener is the result of the Breen's knowledge in Cryonic Technology. the Biothermal Dampener is a grenade-like device that will freeze the ground it comes into contact with while causing the air above it to crystallize into soft flakes of snow
Feb 10, 2011 Patch, reworked the Bio-Thermal Dampener effect to last longer but use a new effect that removes players’ ability to grief.
Previously, it did nothing except ice you. If you were stationary it looked like you were frozen in place but if you moved while "frozen" you could get clear of the ice pretty easily. This would also interrupt any windows that players would have open and close them. Another effect was if it was used during a game of Dabo it would end the game.