ZanEom is a legendary Runeword created by combining a Zan Rune of Ritual and a Eom Rune of Invocation.
How to Create ZanEom
You can create ZanEom by adding the magic Zan Rune of Ritual and the legendary Eom Rune of Invocation to a two-socketed 
Helm, 
Chest Armor, 
Pants, or 
Two-Handed Weapon.
Overflow
When ZanEom overflows, you receive the Eom Rune's overflow effect (Further Reduced Cooldowns) 0.5 times.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.
Legions
Helltide