I've created an epic endgame variant for Sands. It consists of eight epic challenges. Once a hero finishes their 4th legendary quest, they must draw one card from the epic quest deck and defeat it to win the game. You can see all of the cards over on Board Game Geek and I'll admit, some of them are mighty daunting... so you want good gear.
http://www.boardgamegeek.com/thread/424514
Enjoy!
Judd