Weapon/Armor gains or lose stats for specific action

Hello there!
I have a question. How can I make that a weapon or armor will for example after you win a battle it will lose 2 attack stat or whenever you kill a monster gain 5 defense?
Can someone help me?

I believe you'll need a plugin that uses variables and states to achieve this.

you can't.
by default all equipment has fixed values.

Alternatives are either to use states to be applied on certain conditions, or start looking for a plugin.

There's a Yanfly plugin that makes each item an individual object. You'll need that first. I don't recall the name, but it's something like YEP Item Core.

Then you need to code the -2 per battle on the weapon, or hope someone has already done it.

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