Frosted Encrusted War Hammer  

Its a charged item not a proc you must first put the weapon icon on your quick bar and make sure you have it readied then hold down your use item key (default is E i think) and press the number key that the weapon is on your quick bar (will not work if you click on the weapon )

Excerpt from ...

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Dark Age of Camelot

Version 1.45E Test Release Notes

February 5, 2002

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Chargeable and other Magic Items

Some of the very high level monsters may drop charged items on occasion. This is a new object type that has just been added to the game. Chargeable items are regular weapons/armor/jewelry that have magical spells associated with them. These spells have a limited number of time that they can be used. To use a charged item, drag the object's icon to the quick bar (please note that the object must be equipped for this to work) and then click on it.

There are two types of charged items. The first type is non-rechargeable but the item will still function as normal (i.e. without its spell) once the charge has been expended. This means that if you have a sword with a fire spell attached to it, once the fire spell has been cast, you cannot cast any more spells with the sword, but the sword itself still functions as a regular sword.

The second type of recharged item can be used over and over again, requiring recharging from a special NPC (currently called a spellcrafter, but this name will change shortly). The NPC will charge a fee based on the item type you trying to recharge. See the world notes for a list of Spellcrafter locations.

Most weapons that proc will only do so once yellow to you, sometimes one level after they go yellow to you.

You will have no control over it, it will proc whenever it feels like it.