Okay, I propose an orb that you can feed up to five items to...
This orb has no minimum level, the minimum level will be determined by the highest level item fead to it.
Fead it an item to select from a list that represents attributes that are compatible with the orb and are also present on the item fead to it.
Some effects would automatically turn into a guard effect, some effects will turn into a weapon imbue effect.
Additional compatible effects will be added every other update or so as if an item itself.
The fifth item can apply a set bonus, nothing more and only if such is compatible with the orb.
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I feel that this would fix some reasonable single weapon fighting build holes!