This is a video detailing a Treasure Goblin and Unique mob farming spot, the run confirmation takes about 30 seconds.
If you are quick then you can easily get 3 rares + 8 blues per 2 minutes.
In addition to this, you attain a large amount of gold each time.
Stats
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50% chance of getting the dungeon
-30% chance of treasure goblin
-30% chance of a unique mob
-40% chance of normal mobs.
Hope this helps, and you can sub for more guides to come