IgniVex is a legendary Runeword created by combining a Igni Rune of Ritual and a Vex Rune of Invocation.
How to Create IgniVex
You can create IgniVex by adding the legendary Igni Rune of Ritual and the legendary Vex Rune of Invocation to a two-socketed Helm,
Chest Armor,
Pants, or
Two-Handed Weapon.
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Overflow
IgniVex can not overflow because the amount of Offering you receive from the Igni Rune exactly fills the required Offering of the Vex Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.