I like that, maybe these generic items are considered “Void-Touched” which is like a mechanical modifier of sorts that alters an item’s effects depending on the type of item being modified, at the GM’s discretion. I’m not going to look at every item and try to make a viable void touched counterpart though because that sounds exhausting.
The idea that “The Void” is a corrupting force in the world may force you to confront the cosmology of your game’s world. For those who love worldbuilding I bet that sounds like a blast, but for everyone else it might just be extra work for them, so let’s try to make something interesting that would be worth putting the work in for!
Maybe putting something in a Void Cradle means rolling 1d20 to determine whether or not the item successfully transformed into a void touched equivalent. Meet or beat a Target of say… 14, failure results in the item decaying in some capacity, success results in a usable void touched item.
If you roll too low for it to be successful you may sacrifice 5 HP to sweeten the pot and give your roll a +3. Optionally the target number and the +3 bonus could be GM only information, keeping the players in the dark about whether or not sacrificing 5 HP will be enough. Let’s say PC rolls a 10 on the Void Cradle, GM says failure, PC would like to sacrifice half a Heart to boost their odds, the GM doesn’t tell PC how much their odds were boosted, but they do tell the PC that it still wasn’t enough. The PC then has to decide if they have more HP to burn or would they rather lose that item. If they really need that item, they could sacrifice more HP for an additional boost, but that’s it, if it still fails then the item is gone, if it succeeds though I’d give it a really good void touched modification to make sacrificing that much HP worth it.
Now if the item is from this or any batch of RoR2 items and that specific item has a void item counterpart in RoR2, then I’d say the Target becomes Easy (meet or beat an 11) the in-universe reason could be that the item stared into the void and the void stared back and reached out to it, making it less void touched, but more void imbued. A genuine void item indeed.