UrQue is a rare Runeword created by combining a Ur Rune of Ritual and a Que Rune of Invocation.
How to Create UrQue
You can create UrQue by adding the magic Ur Rune of Ritual and the rare Que 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)
Que - Invoke the Druid's for 3 seconds, granting yourself a Barrier. (300)
Earthen Bulwark
Overflow
UrQue can not overflow because the amount of Offering you receive from the Ur Rune exactly fills the required Offering of the Que Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.