Adding more unique traits to weapons?

I am using RPG Maker MV


I was looking at one of Yanfly's plugins when I noticed that in the video the items that were show had special traits that I had not seen before. 


Things like "This item gains +1 attack for every battle your party completes"


Here is a screenshot of one of the items from the video:





Here is the video just in case you are curious:


http://yanfly.moe/2016/01/22/yep-060-more-currencies/


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So my question is how do I add interesting affects like the one I showed in the screenshot?


Thanks

The only idea i have is to place a common event with a condition... 


Condition would be  When actor X holding weapon Y then yoou have a switch after every battle, that turns on then off.


so when that switch turns on, the character X with weapon Y will get +1 parameter...


there could be better solutions but thats the one i am able to achieve!!

It depends on who you want to gain that +1 - the weapon or the actor.


If you want the actor to gain that +1 (and continue using it even if he equips a different weapon), then it can be done with after-battle events checking the equipped weapon and adding +1 atk to the actor.


If you want it bound to the weapon itself, you'll need a script/plugin. I would suggest using an equipment level script and just have the equipment increase one level per battle won, but other solutions might be better depending on your game (you didn't give enough information on that)

Most of the complex stuff is done with writing JavaScript code in the notebox. I recommend looking through Yanfly's Tips and Tricks videos on their YouTube channels for some great examples on what you can make.