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


Overflow
UrRandom Legendary Rune can not overflow because the Random Legendary 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.