A simple story concept I came up with after listening to a Trailer Music/Soundtrack with the same title last night.
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[b]Background[/b]

There was once a kingdom, its name lost in time, renowned for its vast richness - with lands were so filled with jewels and precious metals, that even gold and silver were considered no more precious than rocks. But an apocalyptic eruption of a volcano destroyed the kingdom, burying the entire continent in ash and dust.

Eons passed, the deserted lands, now referred to as "Sand", have become a home for hideous monsters, and the only legacy left by this lost kingdom is a promise of treasure...

[b]Classes[/b]

Some categories of playable characters that inhabit the universe:

[u]Treasure Hunters[/u]
People who come to the continent for a single purpose: treasure. They are equipped with heavy artilleries meant to destroy boulders, and arrive with beasts of their own, called the Scavengers, to help them hunt and collect valuables. 

[u]Scholars[/u]
A curious bunch who arrive in Sands intending to uncover the mysteries left by the lost kingdom. They study about the continent's history, terrains and environment, and possess the most modern technology to help their research.

[u]Guardians[/u]
A group of people descended from the surviving inhabitants of the lost kingdom, and are said to have superhuman abilities. Wishing to see their ancestors' homeland return to its former glory, they will stop people from defiling their territory at all cost.

[u]Monsters[/u]
Mutated life forms who have gained strength and intelligence after adapting to the post-apocalyptic conditions of Sands. They dislike having foreign creatures traipsing in needlessly into their territories, and will crush those who do.
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That's all I can think of for now, but I suppose this can be expanded upon later when there are more interest.