NeoZec is a rare Runeword created by combining a Neo Rune of Ritual and a Zec Rune of Invocation.
How to Create NeoZec
You can create NeoZec by adding the rare Neo Rune of Ritual and the rare Zec Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Neo - Avoid health damage while fighting for 2 seconds. (200)
Zec - Reduce your active Ultimate Cooldown by 2 seconds. (200)
Overflow
NeoZec can not overflow because the amount of Offering you receive from the Neo Rune exactly fills the required Offering of the Zec Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.