The Crystal Gong and the Elemental Keys.

A gong made of crystal? Sounds stupid. Sounds like something the elves would make. I mean, what do you think happens when you take a hammer made of magical steel and strikes the gong? Seriously, what good is a gong if you can't use it for its purpose. 

- Knutt Hammershield, year 4873 

Created at the dawn of times, the Crystal Gong is said to have been made of the crystallized tears of the Twins. The Twins decreed that the Gong would always exist and help the people of Gemnos in their darkest hour.

Throughout the ages, it has surfaces several times, each time heralding a big change. It's powers are unknown but it is said that striking the Gong with it's hammer heralds the coming of change, of salvation.

The last time it was used was by King Braenor during the First Demon War. After the war, it was hidden in an ancient dwarven fortress, protected by what is called an undefeatable masterpiece of dwarven magic and artisanship. In order to open and use the Gong, you need four keys and the hammer to strike the Gong.

The four keys are each made of an element (earth, fire, water, air). After the war, the earth key was kept by Braenor, King of dwarves. The air key was given to Eldar Sorrowsong, a powerful elven wizard while the water key was given to King James of Tarradar, one of the heroes of the First Demon War. The last key, the fire key, was thrown in Hellmouth, while the hammer was given to Aurac for safekeeping.

Since then, no one has heard of the Gong. Many sages have speculated as to why it didn't surface during the crisis of mankind that was the Second Demon War - perhaps the keys had been lost, perhaps the Gong had fallen into the wrong hands. Or maybe the use of the Gong simply wasn't recorded.

The four keys have likewise fallen off the map. The air key disappeared when Eldar died, the water key vanished presumably when King James' city Tarradar was sacked by gnolls and the earth key, for long a symbol of the dwarven kings, isn't any longer.