Generally, you should include:
I have had the same 4 items (3 rings and a helmet) in the Imprint Slots since I Started doing monoliths, and not once have I received any similar item drops.
I typically kill several champion monsters per monolith, each with a 3% chance to drop a pile of similar items, and of the thousands of Champion monsters killed, it has procd zero times.
Same with the other ones, it just does not seem to work. They are just regular rings, nothing rare. 4 mod rares with 1 exalted mod. The helmet is just a straight up yellow rare item. Yet, nothing is dropping. I have set my loot filter to aggresively highlight items of these types, but still after all this time, nothing.
Bugged?
Thanks!