User blog comment:HazelQuill7445/Awesome fan art/@comment-25936766-20170805230722/@comment-26397825-20170806073016

Weiss actually appears to have one of these rapiers, which have a diamond profile. Each edge is actually tapered and perfectly capable of slashing attacks. The ones that aren't good for slashing in any capacity are actually just foils; they're designed for sport, not actual combat.