need help creating sword upgrade item in mcreator

I am working on a mod that adds a lot of end related features. one of them is a ghost miniboss that spawns in the end and drops an item called tears of sorrow. my idea for how this will work is that you combine the tears of sorrow with any sword or axe on an anvil and it adds 1 extra base damage to the weapon but no more than 5 tears can be applied to one weapon. i am pretty new to mcreator and could use some help creating the procedure code for this mechanic.