NocEom is a legendary Runeword created by combining a Noc Rune of Ritual and a Eom Rune of Invocation.
How to Create NocEom
You can create NocEom by adding the rare Noc Rune of Ritual and the legendary Eom Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Noc - Inflict a Crowd Control that isn't Slow or Chill. (5)
Eom - Reduce your active Cooldowns by 0.25 seconds. (100)
Overflow
NocEom can not overflow because the amount of Offering you receive from the Noc Rune exactly fills the required Offering of the Eom Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.