KaaZec is a rare Runeword created by combining a Kaa Rune of Ritual and a Zec Rune of Invocation.
How to Create KaaZec
You can create KaaZec by adding the rare Kaa Rune of Ritual and the rare Zec Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Kaa - Lose 1% of your Maximum Life. (2)
Zec - Reduce your active Ultimate Cooldown by 4 seconds. (200)
Overflow
KaaZec can not overflow because the amount of Offering you receive from the Kaa 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.