on right click holding a gunpowder:
  name of held item contains "§a§lSkill §4§l[Bom]"
  lore of held item contains "§7Cooldown: §a5s"
  set {_cooldown} to difference between {skill.%player%.lastused} and now
  if {_cooldown} is less than 5 seconds:
    message "&cあなたは &a5秒間 &c待たなければいけない"
    stop
  else:
    execute console command "/effect %player% 11 1 255 true"
    create safe explosion of force 2 at player
    execute console command "/title %player% times 10 30 10"
    execute console command "/title %player% title {""text"":""\u00a7c\u00a7lスキル発動！""}"
    set {skill.%player%.lastused} to now