Thul

If you look at the list of all runes, you can find out the cube recipes to create a rune of one level higher than Thul. Here are the Thul attributes:

Rank: (r10)
Weapon: +3-14 Cold Damage (Cold Length 3 seconds)
Armor/Helm/Shield: +35% Cold Resistance
Ilvl/Clvl Required: 23