Frozen Mallet, some extra utility
Frozen Mallet seems a little left out, so since this an utility item and a MALLET and well mallets like to beat things down and break things to a pulp.
So apart of what it does already it could gain an additional effect passive of...
Basic attacks against slowed targets reduce their bonus armor by 10% stacking up to 4 times for a maximum of 40% for 2 seconds [duration constantly resets remember with every re-applied basic attack]. This makes sense to be as a marksmen utility defensive item to help kite and kill tanks and bruisers. Pretty much this separates it from iceborne and gives it a reason to buy mallet over iceborne (the reverse be true as well). But this be a nice buff to help beat that Irelia and Malphite to a pulp without making the item over the top.