How to edit items?

[Boyegas]

Hello, I want someone to tell me how to edit items, for example make fire sword have atk 400 instead of 20.
Please help
Thank you

 

[Bogart]

open data\items\items.xml
and find

<item id="2392" article="a" name="fire sword">
<attribute key="description" value="The blade is a magic flame."/>
<attribute key="weight" value="2300"/>
<attribute key="defense" value="20"/> <<<<<<<<<<<<<<<<<<<<<< this is defense
<attribute key="attack" value="35"/> <<<<<< this is attack change it to 400 or more
<attribute key="elementFire" value="11"/>
<attribute key="weaponType" value="sword"/>
<attribute key="extradef" value="1"/>
</item>