BacXal is a legendary Runeword created by combining a Bac Rune of Ritual and a Xal Rune of Invocation.
How to Create BacXal
You can create BacXal by adding the legendary Bac Rune of Ritual and the rare Xal Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Bac - Travel 5 meters. (50)
Xal - Gain 20% Maximum Life for 4 seconds. (200)
Overflow
BacXal can not overflow because the amount of Offering you receive from the Bac 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.