There’s a new goblin in the undercity that gives you a bonus chest if you kill it during your run, it has some extra drops as well as tributes to use in the undercity
I thought they’d be way more common than they are though, I’ve had maybe 4 of them spawn
The drops are available game-wide (so not exclusive) but there are tributes for ancestral legendries and unique’s with a higher drop chance for mythics.
The legendary one is pretty good because you’re supposed to be able to target farm + skill rank gear with offerings too so it’s a good way to do that… if it works and if you can get the tributes…