CemRandom Rune is a magic Runeword created by combining a Cem Rune of Ritual and a Random Rune Rune of Invocation.
How to Create CemRandom Rune
You can create CemRandom Rune by adding the magic Cem Rune of Ritual and the magic Random Rune Rune of Invocation to a two-socketed Helm,
Chest Armor,
Pants, or
Two-Handed Weapon.


Overflow
CemRandom Rune can not overflow because the Random Rune Rune does not have an overflow effect.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.