Glacial augment is nice and general, what if we gave it a niche?
One of the biggest problems facing melee champions is simply being in range to attack. Unless youre hyper mobile or mostly ability based you have a pretty hard time sticking to people to basic attack them.
What if glacial augment reduced its cooldown per additional basic attack against an enemy in exchange for its slow no longer increasing over two seconds? Unlike the precision runes, this change would be applicable to a wide range of immobile basic attackers; making it a viable contender over things like conqueror or grasp.