ZanOno is a magic Runeword created by combining a Zan Rune of Ritual and a Ono Rune of Invocation.
How to Create ZanOno
You can create ZanOno by adding the magic Zan Rune of Ritual and the magic Ono Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Zan - Cast an Ultimate Skill. (150)
Ono - Invoke the Druid's Dancing Bolts, seeking and dealing damage to enemies. (25)
Overflow
When ZanOno overflows, you receive the Ono Rune's overflow effect (Increased Bolts Spawned) 5 times.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.