CemLac is a rare Runeword created by combining a Cem Rune of Ritual and a Lac Rune of Invocation.
How to Create CemLac
You can create CemLac by adding the magic Cem Rune of Ritual and the rare Lac Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Cem - Cast Evade. (50)
Lac - Evoke the Barbarian's , reducing your damage taken. (800)
Challenging Shout
Overflow
CemLac can not overflow because the amount of Offering you receive from the Cem Rune exactly fills the required Offering of the Lac Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.