YulYom is a legendary Runeword created by combining a Yul Rune of Ritual and a Yom Rune of Invocation.
How to Create YulYom
You can create YulYom by adding the legendary Yul Rune of Ritual and the legendary Yom Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Yul - Cast a Skill with a Cooldown. (50)
Yom - Invoke the Druid's Skill, Stunning enemies, restoring Primary Resource. (500)
Petrify
Overflow
YulYom can not overflow because the amount of Offering you receive from the Yul Rune exactly fills the required Offering of the Yom Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.