XolLac is a legendary Runeword created by combining a Xol Rune of Ritual and a Lac Rune of Invocation.
How to Create XolLac
You can create XolLac by adding the legendary Xol Rune of Ritual and the rare Lac Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Xol - Invoke a Skill from another Class. (150)
Lac - Invoke the Barbarian's , taunting enemies and reducing your damage taken for 3 seconds. (400)
Challenging Shout
Overflow
When XolLac overflows, you receive the Lac Rune's overflow effect (Increased Duration) 0.13 times.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.