While waiting for D4 to launch ive delved back into D2R modding and improved upon my old concept
Simple one:
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Normal unique or Set + Random jewel = Unique scrap
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4 unique scrap = 1 Unique essence
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Normal Unique or Set + UNique Essence= Exceptionnal upgraded version of that item, both base and affixes
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3 unique essence+ jewel = Unique Core
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Exceptional unique or set item+ Unique Core = Elite upgraded version of that item, both base and affixes
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Unique core+ jewel = 3 unique essences
This concept has for goal to create a Sink for excess unique and set item drops
and it aims at providing meaningful and true upgraded version of these items
this ultimately raise up the lower end of itemization to make the endgame itemization richer and more diverse
NOTE: The upgrades are also mostly made of arrays which create a rng element to it, which generates a need and will to roll new ones for possible better rolls