Traits are qualites found on equipment and characters which sometimes provide benefits or penalties. All traits have a chance to activate stated as a percentage on the equipment or character and will provide a positive or negative amount of either attack or defense to either the wielder (in the case of equipment) or the character.
Not all traits are always able to activate. Those traits described as "vs" will only activate against opponents of the listed type or types. For equipment these types are always family types, meaning the trait will only activate against a specific family or families. For characters the types are weapon classes, indicating that the trait will only activate against players using a weapon of that type.