Where can I get the DNF Poison King Ancient Lonely Dark Street suit?

Obviously it’s from another world. I wonder where that other world is? Anyone who has reached max level in the game will know this. . .

Or you can press the big map (N key.

It looks like there is one on the lower right side of the map

However, it is too difficult for you to get that set. The chance of explosion is very low and you can only enter three maps each day three times.