CirThul is a rare Runeword created by combining a Cir Rune of Ritual and a Thul Rune of Invocation.
How to Create CirThul
You can create CirThul by adding the magic Cir Rune of Ritual and the rare Thul Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Cir - Cast the same non-Channeled Skill 3 times in a row. (50)
Thul - Invoke the Sorcerer's , inflicting Freeze and Vulnerable onto enemies. (300)
Mystical Frost Nova
Overflow
CirThul can not overflow because the amount of Offering you receive from the Cir 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.