CirOno is a magic Runeword created by combining a Cir Rune of Ritual and a Ono Rune of Invocation.
How to Create CirOno
You can create CirOno by adding the magic Cir Rune of Ritual and the magic Ono Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Cir - Cast the same non-Channeled Skill 3 times in a row. (50)
Ono - Invoke the Druid's Dancing Bolts, seeking and dealing damage to enemies. (25)
Overflow
When CirOno overflows, you receive the Ono Rune's overflow effect (Increased Bolts Spawned) 1 times.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.