TamChac is a legendary Runeword created by combining a Tam Rune of Ritual and a Chac Rune of Invocation.
How to Create TamChac
You can create TamChac by adding the legendary Tam Rune of Ritual and the rare Chac Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Tam - Cast a non-Channeled Core Skill. (25)
Chac - Invoke the Druid's Lightning Bolt, striking a nearby enemy. (20)
Overflow
When TamChac overflows, you receive the Chac Rune's overflow effect (Increased Bolts Spawned) 0.25 times.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.