I believe this is the case for enemy drops - but it seems, just from being on the forums a bit, that the legendary/unique completion reward is related to the sigil level.
We know, for instance, that legendaries become 100% after a specific level.
If i had to guess , id say that 31+ opens up the chance for uniques, on the low end (5%?)
and every 10 levels up would increase it significantly, 40 being 10%, 50 being 25%, and so on.
Could be way off though
A white/blue/yellow would be less insulting than a barbarian unique while playing a druid.
Getting the unique means I was lucky enough to roll for a unique drop that’s rendered completely unusable by the unique being for the wrong class.
Just remember, some those barbarian uniques can sell for for 200K+ in the vendor. Think of it as free gold that you will need when you upgrade equipment or respec later.
I’ve sold all but one of my Barb specific uniques and have also got plenty of Druid specific uniques. Everything except tempest roar but I do t expect that will drop until I am mid 80’s.
I farm a ton of helltides and got two drops today from them. One was from one of the elite monsters that can randomly spawn when the lava rains down and the other came from an elite monster that I killed during one of the overland events.
I also got a barb unique from Champions demise today and a butcher cleaver as a reward from completing a NM dungeon.
The thing is I’m literally just playing the game and doing the things I like and the drops are just coming naturally. Again the bulk of my time is spent in helltides and I manage to get 3-4 mystery chests depending on the start time from each event plus another 2-3 of the other chests. I’ve learned the good routes and know the spawn points of chests plus I manage to do at least 6 or more of those overworld events along the way.
That more rewards and more chances to get a lucky drop.
I do sit here and wonder if it’s punishment for early access, alot of people I know who are having this problem for Prayer n Tempest all had early access. I know it’s probably not the case, 2 levels up and level 50-60 NM sigil runs and still getting sacred rare and the occasional legendary drops for the reward. lol i feel i might as well just run Nightmare bc Ancestral practically doesn’t exist anymore.
Rant over.
I have the same problem, I’ve been trying to get “Tempest Roar” for more than 10 days, I’ve only duplicate the same bear uniques several times and the worst thing is when you duplicate the barbarian ones, I thought that when I have high level I would have a better chance of getting it, but That’s a lie, you only have more chances of barbarian weapons and duplicating the ones you already have , in the last helltide today, I got two different barbarian uniques, this is worse than having nothing. You lose motivation after so many days and see that these things happen and there is no solution.
Can uniques be traded ?
I found a vasilys last night at level 59 NM dungeon T5
Bruh I’ve literally gotten vasilys 4 times and never once a tempest helm or crone staff…. Ugh.
I’ve gotten like 3 crone staffs. No vasilys or insatiable hunger. At all. Whatsoever. RNG is RNG
Update: After not playing really at all today because of frustration, jumped into a friends party to do WB, I received 1, terrible stats, but a Prayer is a Prayer. No lie it was grind and if its RNG then damn if we gotta go through this every season I’ll reconsider playing this type for future builds and go with strictly non unique items. But happy hunting my fellow druid brothers/sisters, and remember, take a break from the grind if it gets frustrating.
I got a 796 item level Staff of the Crone today from a nightmare dungeon. I have a higher level Waxing Gibbous I really love. So, I had to put the staff in my vault. I also think the staff would be better if it added Storm Strike’s vulnerable modifier.
I FINALLY got it after fully fleshing out a different build, so i just threw it in my stash lol. Too late for it to be useful now that im building werenado that doesnt need it. Feels bad 
Same situation here, started off as Pulverise build currently level 93, have around 5 Vasiliy’s in stash and multiple chest uniques and various Barb uniques but been trying to get Temerity and Tempest Roar to drop for a week straight and no joy yet
That blows, I was so tempted to go stormwolf, or even a decent companion build but I kept holding off…lol mainly bc of the paragon board, way to many nodes to remove.
I’m 83 and get more rogue necromancer and barb unique drops than I do Druid. Still no tempest roar but I have like 3 or 4 vasilys prayer.
They should have a way for you to give items you don’t want to other players and the other players could give you items they don’t want.