YulCeh is a legendary Runeword created by combining a Yul Rune of Ritual and a Ceh Rune of Invocation.
How to Create YulCeh
You can create YulCeh by adding the legendary Yul Rune of Ritual and the magic Ceh Rune of Invocation to a two-socketed Helm, Chest Armor, Pants, or Two-Handed Weapon.
Yul - Cast a Skill with a Cooldown. (50)
Ceh - Summon a Spirit Wolf to attack enemies for 8 seconds. (100)
Overflow
YulCeh can not overflow because the amount of Offering you receive from the Yul Rune exactly fills the required Offering of the Ceh Rune.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.