TamMet is a legendary Runeword created by combining a Tam Rune of Ritual and a Met Rune of Invocation.
How to Create TamMet
You can create TamMet by adding the legendary Tam Rune of Ritual and the magic Met Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Tam - Cast a non-Channeled Core Skill. (25)
Met - You leave the Necromancer's Desecrated Ground behind you for 3 seconds, dealing damage to enemies within. (100)
Overflow
TamMet can not overflow because the amount of Offering you receive from the Tam Rune exactly fills the required Offering of the Met Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.