In 'Dark Souls,' Offline Allies Become Online Friends

"Demon's Souls" had an interesting online concept: as you're playing through the game, your actions are recorded, and the ghost of your character can appear in someone else's game. For example, say you're trying to defeat an enemy (and probably dying repeatedly) your bloodstain could appear in a friend's game, then they can click on [...]

Source: http://multiplayerblog.mtv.com/2011/04/27/in-dark-souls-offline-allies-become-online-friends/

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