PocThul is a rare Runeword created by combining a Poc Rune of Ritual and a Thul Rune of Invocation.
How to Create PocThul
You can create PocThul by adding the rare Poc Rune of Ritual and the rare Thul Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Poc - Spend 5% of your Maximum Resource. (5)
Thul - Invoke the Sorcerer's , inflicting Freeze and Vulnerable onto enemies. (400)
Mystical Frost Nova
Overflow
PocThul can not overflow because the amount of Offering you receive from the Poc Rune exactly fills the required Offering of the Thul Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.