We can't find any source for this item (quests reward, drop, etc). It's highly probable this item is not obtainable right now. It seems that the New Stivali da lavoro ombrati dell'arcimago is obtainable.
Obtained at 590+ GS from Unhallowed infestation at Mangled Pox Gate.
I recommend farming the crawlers on the road. Group up and nuke them, leave the area for about 2 minutes and they'll respawn.
Wow, these are INSANE tempest boots for mages, and even corruption portals. Absolutel beast of a set.
Dropped 592 from Unhallowed Devout this evening! I screamed! After 6 days of 10-24hr farms, now to collect Avenging Pauldrons & Fearless Spy's Boots :D
still drop 590 and above?