on right click holding a gunpowder:
  name of held item contains "§a§lSkill §4§l[Bom]"
  lore of held item contains "§7Cooldown: §a5s"
  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

on right click holding a feather:
  name of held item contains "§a§lSkill §f§l[Levitation]"
  lore of held item contains "§7Cooldown: §a10s"
  execute console command "/execute %player% ~ ~ ~ /effect @e[name=!%player%,r=4] 25 3 5 true"
  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

on right click holding a iron_sword:
  name of held item contains "§a§lSkill §c§l[Kill]"
  lore of held item contains "§7Cooldown: §a50s"
  execute console command "/execute %player% ~ ~ ~ /kill @e[name=!%player%,r=4]"
  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

on right click holding a fire_charge:
  name of held item contains "§a§lSkill §6§l[Fireball]"
  lore of held item contains "§7Cooldown: §a3s"
  cancel event
  shoot an fireball at speed 2
  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

on right click holding a fishing_rod:
  name of held item contains "§a§lSkill §3§l[Jump]"
  lore of held item contains "§7Cooldown: §a15s"
  cancel event
  execute console command "execute %player% ~ ~ ~ /effect @e[name=!%player%,r=4] 25 10 120 true"
  execute console command "execute %player% ~ ~ ~ /scoreboard players set @e[name=!%player%,r=4] jump 1"
  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
  wait 1 ticks
  execute console command "execute %player% ~ ~ ~ /effect @e[score_jump_min=1] 25 0"
  execute console command "execute %player% ~ ~ ~ /scoreboard players set @e[name=!%player%,r=4] jump 0"

on right click holding a diamond:
  name of held item contains "§a§lSkill §e§l[Heal]"
  lore of held item contains "§7Cooldown: §a12s"
  cancel event
  execute console command "effect %player% 6 1 0 true"
  execute console command "execute %player% ~ ~ ~ /particle totem ~ ~0.5 ~ 0 0 0 0.2 20"
  execute console command "execute %player% ~ ~ ~ /playsound minecraft:entity.player.levelup master @a ~ ~ ~ 1 2.0"
  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