Martin had given up the ways of the warrior a long time ago, and it had been many seasons since he had gone questing to learn about his father in the North Lands, since then a grand tapestry had been fashioned of him and hung in the Great Hall. Martin felt a restless urge, like something was missing, a need to go questing once again. One night, he had a vision, of a land to the south across the sea in need of great help. So Martin retrieved his sword from the weathervane and left the comfort of Redwall Abbey, to go on his final quest.
Far across the sea in the deep south, was a kingdom called the Emerald Country, and in it all sorts of goodbeasts roamed in peace, until one day a Pine Marten, Sharpclaw the Fierce, and his vast horde of Golden Vermin arrived and conquered the land, and set up a base in a castle, Castle Rootdeep. But luckily for the inhabitants of Emerald Country, help was on the way, Martin the Warrior was coming to help them.