Ring of Frost is a level 40 Frostmage talent. The mage conjures a large circle that will instantly freeze any enemy or attackable mobs that enter the circle.
Jaina uses a massive version of this ability to temporarily dispel or at least neutralize the Blight at Lordaeron Keep.[1]
Patch changes
Patch 7.0.3(2016-07-19): Now available at level 75 (was 45).
Patch 5.2.0(2013-03-05): Ring of Frost cast instantly through [Presence of Mind] now has a 2-second arming period before the Freeze effect is activated against targets in the area of effect. The 2-second arming period can be reduced by Haste.
Patch 5.1.0(2012-11-27): Now has a 45 second cooldown, up from 30 seconds, and can no longer affect more than 10 targets.
Patch 5.0.4(2012-08-28): Now a talent, has a 2 sec cast time, and causes targets to instantly become frozen. Cooldown reduced from 2 min to 30 sec, and duration reduced from 12 to 10 sec.
Patch 4.2.0(2011-06-28):[Deep Freeze] and Ring of Frost will cause diminishing returns on each other, in addition to the spells they normally share diminishing returns with.
Patch 4.2.0(2011-06-28): Ring of Frost now has a 1.5 second cast time.
Patch 4.0.6(2011-02-08): Radius shrunk to 8 yards, and inner "safe" radius is now 4.7 yards (exactly matching graphic). Dispelling the effect of Ring of Frost will now make the target immune to being refrozen for 3 seconds. If a second Ring of Frost is cast by the same mage while the first is still active (via [Cold Snap]), the first will now disappear and cease functioning. In addition, Ring of Frost now has a PvP duration of 8 seconds.
Patch 7.0.3 (2016-07-19): Now available at level 75 (was 45). 
[10-50] The Battle for Lordaeron
