Hello there!
Make sure that the server recognizes and handles these items correctly. If the old items have a specific case in the 'char_item' function, then yes, you will likely need to add a similar case or 'if' statement for your new items to ensure they function properly.
Hello!
In order to edit the damage that is being dealt with Critical + Penetration, first, you need to understand how it works.
So, for example, the basic damage is 31k.
Penetration -> 31k x 1.5 = 46.5 (rounded down to 46)
Critical -> 31k x 2 = 62
Critical + Penetration -> 46 + 62 = 108
In game damage - 98
If you need more help, let me know.