UrTeb is a magic Runeword created by combining a Ur Rune of Ritual and a Teb Rune of Invocation.
How to Create UrTeb
You can create UrTeb by adding the magic Ur Rune of Ritual and the magic Teb Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Ur - Your Minion or Companion kills an enemy or dies. (10)
Teb - Evoke the Necromancer's , counterattacking damage from enemies and Healing you when they die. (100)
Abhorrent Iron Maiden
Overflow
UrTeb can not overflow because the Teb Rune does not have an overflow effect.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.