UrYom is a legendary Runeword created by combining a Ur Rune of Ritual and a Yom Rune of Invocation.
How to Create UrYom
You can create UrYom by adding the magic Ur Rune of Ritual and the legendary Yom Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Ur - Your Minion or Companion kills an enemy or dies. (10)
Yom - Evoke the Druid's , Stunning enemies and increasing your Critical Strike Damage against them. (500)
Petrify
Overflow
UrYom can not overflow because the Yom 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.