Board Thread:False Info and Speculative Discussion/@comment-27547895-20160203212624/@comment-11533671-20160213074743

According to [], Argent means "Silver" and within the TW universe: "the legend that "silver kills werewolves" refers to the family called "Silver" not the metal."

The Argent Necklace is a silver pendant & family heirloom that Kate passes to Allison while encouraging her to look up their family history with "La Bête du Gévaudan". ([])

Combined with all of that and how silver is used in the Argent's "signature" weaponry I'd say the possibility is strong that silver is the Beasts' weakness.

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