on right click:
    player is sneaking
    set {_itemName} to name of player's tool
    {_itemName} does not contain "+"
    if player's offhand item is iron nugget:
        set name of player's tool to "&f%name of player's tool% &a+鉄塊"
        synthesize(player)
    if player's offhand item is spider eye:
        set name of player's tool to "&f%name of player's tool% &a+クモの目"
        synthesize(player)

function synthesize(p: player):
    remove 1 of {_p}'s offhand item from {_p}
    command "/execute %{_p}% ~ ~ ~ playsound minecraft:ui.button.click master %{_p}% ~ ~ ~ 1 1"

on damage:
    attacker is a player
    set {_itemName} to name of attacker's tool

    if {_itemName} contains "+鉄塊":
        damage victim by 2 hearts

    if {_itemName} contains "+クモの目":
        apply potion of poison of tier 2 to victim for 5 seconds