ZanQue is a rare Runeword created by combining a Zan Rune of Ritual and a Que Rune of Invocation.
How to Create ZanQue
You can create ZanQue by adding the magic Zan Rune of Ritual and the rare Que Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Zan - Cast an Ultimate Skill. (150)
Que - Invoke the Druid's for 3 seconds, granting yourself a Barrier. (300)
Earthen Bulwark
Overflow
ZanQue can not overflow because the amount of Offering you receive from the Zan 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.