Foil Creation Mechanic (Suggestion)

Proposal:
Implement a way to turn rares into Foil versions of themselves

Considerations:
Preserve foil rarity

Ideas:
-Similar to Locus of Corruption, have a mechanic that offers a chance at turn a rare item into a foil version of the item.

-Make the mechanic itself require farming to access (like locus)

-Make the mechanic have additional cost but less drastic downsides (no item destruction). This could be a resource that is required at the 'alter' (like harvest juice) Lower chances of success (<25%) to account for less drastic downside.

-Allow use on mirrored/corrupt items. Downsides could include things like a divine roll messing up stat rolls, a socket color change, etc, which would still be very bad on an otherwise unalterable item. (and allow for a secondary technique of attempting to improve bad mirrored items from mist)