certain player data points must be tracked and stored.  
These are all stored in the following way:

    per player,
    per storyline per player,
    per world per storyline per player,
    per excursion per world per storyline per player

tracked data:

    location
    inventory
    playerdata
    time tracking
    kill/death ratios
    ?

breakdown:

    LOCATION
        - xyz yaw pitch
    INVENTORY
        - inventory
        - enderchest
    PLAYERDATA
        - exp
        - health
        - food
        - saturation
        - exhaustion
        - air
        - fireticks
        - walkspeed
        - active potion effects
            - name
            - duration
            - amplifier
            - isAmbient
            - hasParticles
            - Color (if it has one)
    
    TIME TRACKING
        - total time spend
        - time last entered
        - time last left
    
    KILL/DEATH:
    
        ANY PLAYER:
            - last kill
                - time
                - time since previous
                - victim uuid, name
            - last death
                - time
                - time since previous
                - killer uuid, name     
            - # kills
            - # deaths
            
        EACH PLAYER:
            - uuid, name
            - last kill
                - time
                - time since previous
                - your k/d at the time
                - their k/d at the time
            - last death
                - time
                - time since previous
                - your k/d at the time
                - their k/d at the time      
            - # kills
            - # deaths

    to be continued?