Unique Passive – Icy / Spellblade: After using an ability, your next basic attack deals 125% base AD bonus physical damage to surrounding enemies and creates a field (radius of 180 (+55% bonus armor) for 2 seconds that slows enemies inside by 30% (1.5 second cooldown).
The item was originally called "Frozen Fist", and is still often referred to as such.
The area damage inflicted by the Gauntlet is only the 125% of the champions base Attack Damage coming from the item. The splash does not include the damage from the actual attack itself, or any other sources of damage on the hit such as Siphoning Strike
Iceborn Gauntlet will stack multiplicatively with other active slows such as Twin Shadow and Bilgewater Cutlass which all stack with each other, still limited by the ordinary slow diminishing return rules, because these active slows are categorized as champion active abilities.
The Iceborn Gauntlet refers to the Freljordians who were given power by the Frozen Watchers. These people were called Iceborn. Their leader was Lissandra.
Unique Passive – Spellblade: After using an ability, your next basic attack deals bonus physical damage equal to 125% of your base attack damage to surrounding enemies and creates a field for 3 seconds that slows enemies inside by 35%. 3 seconds cooldown.