CemVex is a legendary Runeword created by combining a Cem Rune of Ritual and a Vex Rune of Invocation.
How to Create CemVex
You can create CemVex by adding the magic Cem Rune of Ritual and the legendary Vex Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Cem - Cast Evade. (75)
Vex - Gain +3 to all Skills for 8 seconds. (1000)
Overflow
When CemVex overflows, you receive the Vex Rune's overflow effect (Increased Duration) 0.05 times.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.