UrLum is a magic Runeword created by combining a Ur Rune of Ritual and a Lum Rune of Invocation.
How to Create UrLum
You can create UrLum by adding the magic Ur Rune of Ritual and the magic Lum Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Ur - Your Minion or Companion kills an enemy or dies. (10)
Lum - Restore 2.5 Primary Resource. (5)
Overflow
When UrLum overflows, you receive the Lum Rune's overflow effect (Increased Resource Restored) 1 times.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.