NeoThul is a rare Runeword created by combining a Neo Rune of Ritual and a Thul Rune of Invocation.
How to Create NeoThul
You can create NeoThul by adding the rare Neo Rune of Ritual and the rare Thul Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Neo - Deal damage after not taking any within 2 seconds.
(Resets if Invulnerable.) (200)
Thul - Invoke the Sorcerer's , inflicting Freeze and Vulnerable onto enemies. (400)
Mystical Frost Nova
Overflow
NeoThul can not overflow because the amount of Offering you receive from the Neo 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.