CemTun is a magic Runeword created by combining a Cem Rune of Ritual and a Tun Rune of Invocation.
How to Create CemTun
You can create CemTun by adding the magic Cem Rune of Ritual and the magic Tun Rune of Invocation to a two-socketed Helm,
Chest Armor,
Pants, or
Two-Handed Weapon.
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Overflow
When CemTun overflows, you receive the Tun Rune's overflow effect (Increased Grenades Spawned) 2 times.
Overflow occurs when your Ritual generates more Offering than required for the Invocation. The overflow effect is proportional to the amount Offering overflows.