NocMet is a rare Runeword created by combining a Noc Rune of Ritual and a Met Rune of Invocation.
How to Create NocMet
You can create NocMet by adding the rare Noc Rune of Ritual and the magic Met 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. (10)
Met - You leave the Necromancer's Desecrated Ground behind you for 3 seconds, dealing damage to enemies within. (100)
Overflow
NocMet can not overflow because the amount of Offering you receive from the Noc Rune exactly fills the required Offering of the Met Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.