King Arthur: Knight's Tale

King Arthur: Knights Tale mixes an XCOM-style turn-based combat system with traditional role-playing mechanics, including character development, decisions that influence the direction of your campaign, and the expansion of your home base, Camelot. The story follows Sir Mordred as he travels through Avalon with a group of knights in search of King Arthur. This is already an interesting twist on the classic legend, as Sir Mordred is King Arthur's arch-enemy, traditionally portrayed as the king's treacherous nephew. In this version of the saga, Mordred has actually mortally wounded Arthur and is now pursuing him through the Isle of Avalon at the command of the Lady of the Lake to end the matter.
Story
You are Sir Mordred, the arch-enemy of King Arthur, the former Black Knight from the Grim Tales. You killed King Arthur, but with his last breath he struck you down. You both died - and yet you both live. The Lady of the Lake, the ruler of the mystical Isle of Avalon, brought you back to end a true nightmare. She wants you to go on a chivalrous quest. She wants you to finish what you started. Kill King Arthur - or whatever he became after she brought his dying ship to Avalon.