"Excellent," says the dwarven chief, clapping his hands together in glee at the prospect of adventurers willing/foolish enough to accept a quest before knowing all the details. "The Worldsgate is a day's travel toward the centre of the world, where Maia is highest in the sky. You may have seen it in the plains on your way up here. Your job will be to travel to the world of plates and recover an object of great importance."
Cleavewoods begins walking back up the mine shaft, beckoning you to follow as he speaks.
"According to legend, the world of plates was forged by a god known as Alex, the creator of the first dwarves. His world was much unlike ours in that its sun moved across the sky, so that all parts would experience light and dark. Their people measured days not by the movements of Maia's Children in the sky but by the movement of their sun. Furthermore their world was not solid all the way through as Aether is, but merely great plates of land suspended in the air by Alex's will.
"Alex brought elves from Aether to live on his world also, but the two races committed some unknown transgression against Him, so He created great fortresses and sealed them within, providing for them an eternal source of food in a pair of altars, which when prayed at would summon a bountiful meal.
"These altars are the key to my people's survival at this place. Without one, we will be forced to move on to greener pastures. Now, it so happens that when the god Alex supposedly died, Gheronaton is said to have opened up the altars and ended the sentence of the Plateworld's people. After doing so, the dwarves remained but the elves all returned to Aether. This means that one of the altars is unguarded. Your quest is to retrieve this altar and bring it back to us."
By this time, you have returned to the throne room.
"Do you have any questions?"
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Edit: On Mythril. Oops! But then, who's to say that actually mythril? Unless we've established that mithril with an I exists, I can work around this.