NocGar is a rare Runeword created by combining a Noc Rune of Ritual and a Gar Rune of Invocation.
How to Create NocGar
You can create NocGar by adding the rare Noc Rune of Ritual and the magic Gar 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)
Gar - Gain 2.5% Critical Strike Chance for 5 seconds, up to [2.5*10]%. (25)
Overflow
NocGar can not overflow because the amount of Offering you receive from the Noc Rune exactly fills the required Offering of the Gar Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.