Eld

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 Eld. Here are the Eld attributes:

Rank: (r2)
Weapon: +75% Damage vs. Undead, +50 Attack Rating vs. Undead *
Armor/Helm: Lowers Stamina drain by 15%
Shield: +7% Blocking
Ilvl/Clvl Required: 11