I get the sword from Shadow Of Colossus, hmm it's pretty effective against the colossi but what about zombies? Unless the sword as some other power other than finding and killing the Colossi, like it makes you immune to zombie bites. Then I'm fucked especially in a large crowd, a close range weapon such as a sword isn't going to do much.
Also off topic here: If the sword really does have some other power and it's a spoiler in the game, please don't tell me. I'm only on the 8th boss fight. I don't get a lot of playing time what with Uni course work and all.