CirChac is a rare Runeword created by combining a Cir Rune of Ritual and a Chac Rune of Invocation.
How to Create CirChac
You can create CirChac by adding the magic Cir Rune of Ritual and the rare Chac Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Cir - Cast 5 Skills then become exhausted for 3 seconds. (300)
Chac - Invoke the Druid's Lightning Bolt, striking a nearby enemy. (20)
Overflow
When CirChac overflows, you receive the Chac Rune's overflow effect (Increased Bolts Spawned) 14 times.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.