Ice attacks slows down the foe and weaken them, making them easier targets.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Models with the Ice Attacks special rule cause all enemy models in base contact with them to be subject to the Always Strikes Last special rule. Spells or missile attacks that are Ice Attacks cause the enemy to be subject to the Always Strikes Last special rule until the start of your next turn if they are successfully cast or Hit. Models with Ice Attacks have Immunity (Ice Attacks).
Unless otherwise stated, a model with this special rule has Ice Attacks for both shooting and close combat, (though any spells cast by the model or special attacks are unaffected).