How to Create an Axe that Summons Lightning on Hit in Minecraft

Before we start, let's get a special diamond axe with the supermachado tag, use this command:

give @p minecraft:diamond_axe[minecraft:custom_data={supermachado:1b},minecraft:rarity=rare,minecraft:enchantment_glint_override=true]

And create the scoreboard that will detect damage dealt by ourselves

scoreboard objectives add dano minecraft.custom:minecraft.damage_dealt

After that, place a Repeat command block set to Always Active with this command:

execute as @a if score @s dano matches 1.. run function comandos:summon_lightning

Whenever a player deals damage, the commands in the function will execute from their position

Download the ready and complete function by clicking here and place it inside the datapacks folder

If you've never created a function and don't know what it is, check this tutorial to understand and do this process

Here are the commands from the function I created to summon lightning whenever a mob takes damage

effect give @s minecraft:resistance 1 4 true

execute if items entity @s weapon.* minecraft:diamond_axe[minecraft:custom_data={supermachado:1b}] run execute at @e[type=!player,limit=1,sort=nearest] run summon minecraft:lightning_bolt ~ ~ ~

scoreboard players set @s dano 0

In short, the effect command is to minimize the lightning damage to ourselves

The second command detects if we're holding the diamond axe with the supermachado tag and then summons lightning on the nearest mob to us

The last command resets the score gained from dealing a hit, preventing the command from running infinitely

Test it out and have fun!