D&D 5e: Looking to base weapon damage on Con instead of Str or Dex

I'm looking to make a weapon for one of my players attack based on Con, not Str nor Dex.&nbsp; I am looking to make the change in the 'Mods' section of the item so that even if the item 'refreshes', it keeps the correct ability mod value.&nbsp; What keyword would fix this?&nbsp; All I can find on Mods are the below 2x links, both of which are pretty basic in what they imply can be done. <a href="https://app.roll20.net/forum/post/5699857/list-of-available-mods-that-work-with-the-5e-oglsheet/?pageforid=5700528" rel="nofollow">https://app.roll20.net/forum/post/5699857/list-of-available-mods-that-work-with-the-5e-oglsheet/?pageforid=5700528</a> <a href="https://wiki.roll20.net/D%26D_5E_by_Roll20" rel="nofollow">https://wiki.roll20.net/D%26D_5E_by_Roll20</a>

Hi, haven't tried, but my understanding is that if you mod it here but then rename it to something unique, it won't be auto-updated causing a loss of any change

I was hoping to keep the item in the inventory and the 'Attacks &amp; Spellcasting' section linked, so I can update the item in the future with new stats and have it reflected in the Attack