what I found ingame about loot drops

1 normal enemies, champions with blue name and yellow name they drop white and blue equipment and rarely skill gems.
2 acts mini bosses and area bosses drop white, magic, rare and unique items with with skill gems.


so what one wants to farm fast and repeatedly are the low level area bosses for rare upgrades and unique are specific to each boss and mini bosses. and dismantle the equipment that is not helping the character.
and when progressed enough in act 1 dismantle at workbench for quality materials and sockets.
so to get good gear and upgrade materials can be farmed from act 1 mini bosses and area boss.

that way one can easier farm rare upgrade materials , socket upgrades and quality upgrades.

this loot setup makes in campage more enemies mostly just exp bags with gold
since the proper materials and equipment are all on the bosses.

this is now adjusted it seems bosses still have highest chance for rare where as champions the blue and yellow names have now a small chance to drop rare.