i play on a server where damage and health can get pretty big, my character for example has 50 hp and do 12 base damage.
for me to balance the mod for the server i need to directly edit on the jar which is not optimal.

Hello!
There are multiple ways to configure how much damage a particular class does.
The easiest one, is to change config/paladins/items.json by boosting attribute values.
A more advanced method, is to create a datapack that overrides spell data files, with changed multiplier values in it. :)