On rightclick:
    if player is holding Paper named "&bMocne walniecie":
        if player has permission "wojownik":
            if difference between {Wojownik::%player%::lastuse} and now is smaller than 30 seconds:
                send "&6[ &eSkille &6] &230 &7sekund do ponownego uzycia"
                stop
            set {Wojownik::%player%::lastuse} to now
            send "&6[ &eSkille &6] &7Uzyles Mocnego walniecia"
            push the player upwards at velocity 1
            wait 1 second
            spawn 2000 of particle Magic Crit:1 offset by 0, 5, 0 at player
            loop all entities within 5 meters of the player:
                damage loop-entity by 1.5 heart
        else:
            send "&6[ &eSkille &6] &7Ta umiejetnosc nie jest dla twojej klasy!"