YaxMet is a magic Runeword created by combining a Yax Rune of Ritual and a Met Rune of Invocation.
How to Create YaxMet
You can create YaxMet by adding the magic Yax Rune of Ritual and the magic Met Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Yax - Drink a Healing Potion. (100)
Met - You leave the Necromancer's Desecrated Ground behind you for 3 seconds, dealing damage to enemies within. (100)
Overflow
YaxMet can not overflow because the amount of Offering you receive from the Yax 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.