Ah, the Ice Guard. It is a thin sheen of protective magic that covers certain pieces of equipment. Those that do battle with creatures of frost and ice will gain increased protection from their attacks by using the Ice Guard.
As with all things the Wrathcaster creates, there is a price - a price that I will not lower, regardless of how much you whimper. Interested?
Enjoy the repair costs, <race>. Naxxramas is 'unkind' to the uninitiated.