TL:DR = Add cube recipe
reforges an existing primal ancient item to a new version of the same primal ancient item.
cost: 300 primordial ashes + 3000 deaths breaths
this would work the same way as reforge legendary item, except you have to put a primal item in and the reforge keeps it being primal, it just rerolls all the affixes as if its a new drop of the same item.
you grind a long long time to find those primals, if you get one for your set/build theres a very real chance thats the only time in the season youll ever get that particular item as a primal. so if its got bad stats and you cant use it that kind of sucks.
now rng is rng, there should be a chance it sucks, thats fine. but it would be cool if there was a way to grind the materials to have another shot at it. it should take a lot of materials, grinding 300 prim ashes per shot is a lot of work but it gives you something to work towards.
the game should have a lot of rng, thats what makes looting games fun. finding the primal in the first place is massive rng, but its also good to then have realistic goals you can work towards. say you need to roll it 3 times to get it how you want it, thats 900 ashes and 9000 dbs, that could be a couple of weeks grinding for the ashes. i would argue that D3 among many current arpgs are struggling to give people a reason to play for more than couple of weeks to begin with because people run out of things they can realistically pursue. They dont have full primal gear, but thats not a realistic goal so theres no motivation there, finding another 300 primordial ashes for another shot at rerolling that item is achievable, desirable but is also not a trivial task, theres still an rng luck element to it and it adds more value to all primal drops because you never know when your next primal could be something amazing that will need 600-1200 ashes to reroll.