New creature entity in addition to existing Snow Man. Mostly melee, but, if there few enemies around it, Snow Spider will explode causing freezing effect on surrounding Pawn and Buildings. So it will require some proper positioning to prevent cascade explosion of them. After researching few of them you can unlock recipe to craft material required for Atmospheric Controller, which combines feature of Atmospheric Heater and Atmospheric Cooler (So can work like in-wall Cooler from vanilla with adjustable temp, but for whole map. Not sure why vanilla game have only AHeater).