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You can give the player a stick to use for this with a custom tag like so:

give @p stick{levitation:1} 1

Then you can add a custom advancement to a datapack (.json) with any name you want, I chose 'hurt_test.json'. The code is this:

{
    "criteria": {
        "hurt": {
            "trigger": "minecraft:entity_hurt_player",
            "conditions": {
                "damage": {
                    "type": {
                        "source_entity": {
                            "equipment": {
                                "mainhand": {
                                    "item": "minecraft:stick",
                                    "tag": "levitation:1"
                                }
                            }
                        }
                    }
                }
            }
        }
    },
    "rewards": {
        "function": "myepicdatapack:hurt_by_stick"
    }
}

The code checks if the player has been hurt by any entity (including other players), and checks if that entity was holding a stick with the 'levitation:1' tag. If this is all true it runs the function 'hurt_by_stick' from your datapack. Now you can add some code in that function:

effect give @s levitation 5 2
advancement revoke @s only myepicdatapack:hurt_test

This function (ran when the advancement checking for damage with the stick is dealt) gives the effect for 5 seconds with an amplifier of 2 (can be changed between 0-255) and it removes the testing advancement from the player so that the method can be used again.

I didn't have time to test all this myself, but everything should work. The only things that I'm uncertain about are the custom tags and the advancement.

Hello! To me everything seems perfect, I even tried it myself and it works flawlessly. So you have these commands in a ticked function or repeating command blocks:

/execute as @e[tag=NexusTestWaystone,tag=!inZone] at @s if entity @p[distance=..1] run tag @s add inZone
/execute as @e[tag=NexusTestWaystone,tag=inZone] at @s unless entity @p[distance=..1] run tag @s remove inZone

This works without problems, maybe you just made a small mistake when using the commands?

You can store the player's starting armor damage in a score like this:

/execute store result score @p durability run data get entity @p Inventory[{Slot:102b}].tag.Damage

Of course, this is damage, not the durability value, but that does not matter for our use. You cannot directly modify the player's NBT (so their inventory), but you can other entities'. We will summon an armor stand holding an iron chestplate like so:

/summon armor_stand ~ ~ ~ {Tags:["chestplate"],HandItems:[{id:"minecraft:iron_chestplate",Count:1b,tag:{Damage:1}},{}]}

I gave it a damage value of 1 because then we can modify it (if there is no damage, we can't modify the value). We will now copy the scoreboard value to the damage of the armor stand's iron chestplate like this:

/execute store result entity @e[tag=chestplate,limit=1] HandItems[0].tag.Damage int 1 run scoreboard players get @p durability

Finally, we can copy the item from the armor stand to the player like so:

/item replace entity @s armor.chest from entity @e[tag=chestplate,limit=1] weapon.mainhand

Using all these commands and a simple command to decrease the durability value, you can do exactly that!

Oh, okay

Glad I could Help!

Thank you good sir! It worked perfectly and I also figured out how to make the death sound because of you. I used absorption hearts tag to make the death sound since it didn't work with normal health.

Here's the command if someone is interested:

/execute at @e[tag=boss,nbt={AbsorptionAmount:0f}] run playsound minecraft:entity.husk.death hostile @a ~ ~ ~ 0.9 0.7

The same concept holds. Use the target selector @e[tag=YourMobTag,nbt={HurtTime:10s}]. It doesn't have to look exactly like this to work, but for what you're doing, it's probably the best.

The full command would look something like this.

/execute at @e[tag=YourMobTag,nbt={HurtTime:10s}] run playsound ...

I'm trying to make custom sounds for a mob when it takes damage or dies. I tried to use the commands from the links below but it seems that they don't work in 1.14. So any ideas how to execute sound command at mob when it takes damage or dies?

https://www.minecraftforum.net/forums/minecraft-java-edition/redstone-discussion-and/2234824-detect-when-mobs-are-hit

https://gaming.stackexchange.com/questions/252661/how-to-detect-if-a-mob-has-been-hit-in-minecraft-with-command-blocks