AhuTal is a legendary Runeword created by combining a Ahu Rune of Ritual and a Tal Rune of Invocation.
How to Create AhuTal
You can create AhuTal by adding the legendary Ahu Rune of Ritual and the magic Tal Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Ahu - Lucky Hit: Up to a [100|%|] chance against Injured enemies. (10)
Tal - Invoke the Spiritborn's Pestilent Swarm, dealing damage to enemies. (100)
Overflow
AhuTal can not overflow because the amount of Offering you receive from the Ahu Rune exactly fills the required Offering of the Tal Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.