Shardblades can cause the armor to crack and break. If it is too hard, it will crack rather than deform. It does not easily crack or split or warp. We'd crack each other up and fall down laughing. You could crack them open and really develop them. Matthews was addicted to crack cocaine at the time. He eventually began freebasing crack cocaine. PVC cards can crack or break if bent/flexed excessively. I'd probably crack his head open to show him how valuable I was. The coating can crack, but it will not peel. Super Hans develops a crack cocaine addiction. Subsequently, Phil becomes addicted to crack cocaine. They observe that if the stone is not backed it will often crack. Then the crack can linkup back to the main crack. Stone was also susceptible to intense heat, which would cause it to crack and collapse.