YulXal is a legendary Runeword created by combining a Yul Rune of Ritual and a Xal Rune of Invocation.
How to Create YulXal
You can create YulXal by adding the legendary Yul Rune of Ritual and the rare Xal Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Yul - Cast a Skill with a Cooldown. (50)
Xal - Gain 20% Maximum Life for 6 seconds. (200)
Overflow
YulXal can not overflow because the amount of Offering you receive from the Yul Rune exactly fills the required Offering of the Xal Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.