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 Zwiastun Ducha is obtainable.
dropped by sniper at inferior
Dropped at 598 from Sniper in Ambusti Inferior. Full luck gear, no trophies.
Obtained at 590+ GS from Sniper at Ambusti Inferior
Confirmed drop from Scorchvein Sniper in Ambusti Inferior.
dropped from sniper, 590gs