This code is MIT, so I updated it myself. Here is a port of this mod for 1.17.1:

https://github.com/Andrew6rant/tiered/releases

Right now it has feature parity with the latest 1.16 release, but in the future I would like to add a reforging station, modifier weights (dependent on luck), and more modifiers and tiers.

If you plan to expand or maintain Tiered, I would be happy to give you the CurseForge project page. I don't have any personal plans to update the mod feature-wise (just due to a lack of time), but I love the ideas you mentioned. Let me know if this is of interest.

Oh yeah, that sounds great! I am planning on maintaining and expanding on Tiered.

I don't know how transferring a Curseforge project works, but if you need it, my account is: https://www.curseforge.com/members/andrew6rant/

Added, have fun! You should now have full permission on the project page. You'll also receive all the CursePoints from this point forward (so double-check that you're opted in to receive them). I will relinquish my role of project owner once you release an update or two 😆

Thank you!

@Andrew6rant If you are indeed taking over this project, could you add the weights that I've implemented on the forge branch to this one?

@Stereowalker Sure!

Your method of handling weights is significantly better than mine, haha. I first built mine to be a 7-category rarity system, with percentages for Junk (25%), Common (35%), Uncommon (20%), Rare (12%), Epic (6%), Legendary (2%), and Arcane (unobtainable via random drops). Planned to make each tier's percentages be modifiable, but I didn't like how it would've been locked to 7 rarity types.

Since I've already decoupled everything else from my (incredibly janky) weight system, it would be fairly simple (and much better) to replace it with yours.