If putting down a loyal wolf guarding Artorias' grave wasn't heartbreaking enough, I can't imagine the iconic Prepare to Cry video by VaatiVidya helped. And I know for a fact millions of us watched it. Sif is one of Dark Souls' most tragic stories, and there was even a cutscene added in the DLC where he recognizes you if you travel to the past and help the pup, only making the fight that much more painful. But beyond the tragedy, Sif is just plain and simple cool — a massive wolf with a massive sword. It's surprising it took someone this long to turn that into a game.
