I've upgraded like 50 rings on my WD and about 15 on my barb and I have yet to get a Unity of any kind...
Just plain ol' bad luck? Is its chance to roll very low? Why is this so hard to find? (at least it seems that way to me)

Bad luck.

I found about 6 or 7 in a string of a couple days.

Bad luck for u i almost get 1 per day for me its a skull grasp that i didnt get one yet

skull grasp isn't that good anyway

i've never even seen a Band of the Rue Chambers

why would you want a skull grasp?
its completely useless

I hope you're only getting it for collection purposes, that damage is just additive with the normal damage, totally useless.

Its the only ring i miss to have all rings n ammys cubed... im trying to cube every items for all class

Alright good.

Come to think of it, I don't think I've found one yet either in 600+ paragon levels lol

4 seasons and i have found 4 unity rings... had to wait until end of season 2 before i could even play with the bonus. at least ive found em i guess

How much did you play over those 4 seasons?