A small cylinder that has a clear glass middle and gold attachments on each end with a ripcord on the outside. Inside the glass holds a tiny hexcore free floating which even at its small state it can still be very destructive. This magic item has 5 charges. As an action you may pull on the ripcord and use 1 charge which will turn back time by 6 seconds and any damage, movement, effects or anything else that was done within these 6 seconds goes back as if it never happened and the user is the only one to have remembered what occurred in that alternate timeline. The  Z-Drive regains 1d4+1 charges per day.