Ral
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From Diablo Wiki
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 Ral. Here are the Ral attributes:
Rank: (r8)
Weapon: +5-30 Fire Damage
Armor/Helm/Shield: +35% Fire Resistance
Ilvl/Clvl Required: 19