Guild Wars 2

(1): +25 Vitality
(2): +10% Chill Duration
(3): +50 Vitality
(4): 25% chance when struck to cause an ice nova. (Cooldown: 30s)
(5): +100 Vitality
(6): +20% chill duration; +7% damage against chilled foes.

I tried it at the different class NPCs in mist just to see what the ice nova actually does. Let them beat on me, but it didn’t proc even once. Anyone knows if it’s bugged?

I have tested it before, so assuming it’s not bugged it should be just a frost burst, like the elementalist skill and on swap sigil can trigger. Assuming it’s not bugged right now of course…

Do you have a total of 4 of them each equipped to a separate piece of armor.

http://wiki.guildwars2.com/wiki/Rune

Runes provide more bonuses based on the number of identical runes equipped. To obtain the full bonus that the rune provides, an equivalent number of runes of that type should be equipped:

anzenketh.3759:

Do you have a total of 4 of them each equipped to a separate piece of armor.

The PVP Build automatically applies all 6 upon equipping. So that’s not an issue.

Unfortunately I haven’t tested this rune myself since it was never really one I found appealing.