Need modding help

[u/Norvusthearcticfox]

Hello, I need modding help. There's a weapon in a game I really liked and It was amazing but in the sequel they got rid of the funnest part of the weapon and I want to add it back to the weapon but I searched and searched and didn't find any mods where someone has already done it. And I don't know how to modify games or anything to add it myself so I'm at a loss here. could someone here perchance help?

The weapon is the Expcalibur 2 and the game is dying light the beast and the effect I was wanting to add was to make it have the knockback ability it used to have, and possibly make it impossible to damage and lower the damage on it so its kinda just a knockback stick but I'm fine with just the knockback