FeoChac is a rare Runeword created by combining a Feo Rune of Ritual and a Chac Rune of Invocation.
How to Create FeoChac
You can create FeoChac by adding the rare Feo Rune of Ritual and the rare Chac Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Feo - Become Injured or Crowd Controlled. (Cooldown: 10 seconds) (1000)
Chac - Invoke the Druid's Lightning Bolt, striking a nearby enemy. (20)
Overflow
When FeoChac overflows, you receive the Chac Rune's overflow effect (Increased Bolts Spawned) 49 times.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.