Hopefully blizzard doesnt go nerf happy on it.
Ray of Frost - Sleet Storm: Does 280% weapon damage almost as powerful as archon, BUT has a MUCH HIGHER proc rate of 50% if i am not wrong.
You only need about 10-15ap on crit and 40-50 crit chance to perma spam this on more than 3 units.
Teleport - Safe Pasage: Gives 30% dmg reduction which is a huge help for 4 secs also letting you get out of hairy situatioon and into more enemies to blast them with a storm of ice.
Frost Nova - Deep Freeze: Gives 15% extra crit chance when in big mobs which helps alot!
use cold snap for ubers
Diamond skin: No animation required so can still channel Ray of Frost.
can play around with runes depending on your hero
i prefer crystal shell for extra hp
Energy armor - Prismatic: For desecrator/arcane/firechains/molten
Magic Wep - Blood Magic: For lifesteal(very important)
Cold blooded: 20% dps
Astral presence: 2 ap/s and 20 max ap to make up for Energy Armor and to help regen ap
Critical Mass: Cool down frost, diamond, and tele
How it works
Ray of Frost - Sleet Storm has a very small radius, making it hard to hit many enemies and therefore harder to regain AP or to cooldown skills with Critical Mass.
However with the high proc rate this is something that can easily be overcome.
Solution 1: The best one is to invite a monk buddy and get him to use Cyclone Strike to vortex all enemies within 24 yards (larger than Blizzard - Stark winter = 22 yards) to you and then you hit ALOT of things.
This lets you perma freeze, do tons of dps cuz of 280% wep dmg + 20% cold blooded.
Solution 2: Use teleport to blink into large mobs and keep blinking around to which ever group has the most units per area.
This is not as effective but still can be used.
The bad thing is that ranged enemies still get you alot.
THE BEST TEAM
A Monk with Cyclone Strike - To vacuum everything in
A Barb with War Cry - Increase resistance for problem affix elites
A CM/WW Wiz - For perma freeze
A Ray of Frost Wiz - For DPS and extra freeze
Having a good team like this can take me a MP3 wiz up to a MP6 farming efficiently and MP8 for keys and ubers.
Im paragon level 42.