LithTec is a legendary Runeword created by combining a Lith Rune of Ritual and a Tec Rune of Invocation.
How to Create LithTec
You can create LithTec by adding the legendary Lith Rune of Ritual and the magic Tec Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Lith - Stand still while fighting for 0.31 seconds. (25)
Tec - Invoke the Barbarian's Earthquake, dealing damage to enemies within. (100)
Overflow
LithTec can not overflow because the amount of Offering you receive from the Lith Rune exactly fills the required Offering of the Tec Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.