BedWars an idea for a rotational item

[NotHackusatable]

Minecraft username:

NotHackusatable​

Suggestion:

an idea for a rotational item​

Detailed description:

i don't know what to name it so suggest below!
anyway add a melee attack item which when used like a sword, it will deal 3hp of damage whatever what the damaged person is wearing​

Reason(s):

need new rotational items.
just deleting this idea from my head for more storage.​

Example(s):

-if player1 hits player2 with this item, the player2 will take 3hp of damage while wearing: protection 3 chain armor
-if player1 hits player2 with this item, the player2 will take 3hp of damage while wearing: protection 1 diamond armor​