This guide will help you get the Black Hole hidden achievement and the Abyss set introduced in the Fatesworn dlc.
 
 

Requirements

 
Black Hole
 
(Fatesworn) Stacked at least 100 Unholy Void effects with the Abyss armor set before defeating an enemy with magic.
 
 
 

The Abyss Set

In order to get the Black hole achievement, you first need to find the Abyss set, you can only acquire this armour during the night.
 
If you explore every area thoroughly, you will have collected all four pieces by the time you reach Crownhold. With that said i have attached the local map locations.
 
 
the first piece can be found in the southern part of Revival
 
 

 
 
the second piece can be found in the south of the open area in Three Winds Crutch
 

 
 
the third part can be found in the very south of Madding Wind
 
 

 
 
the fourth and final piece is in the Crownhold cemetery, inside the tree hollow
 
 

 
 
 

The Black Hole

the achievement requires you to stack 100 Unholy Void effects and then kill an enemy with magic.
 
So, after making sure you meet the requirements for using the set, you should find a group of enemies and start to cast magic. Remember to heal as you will take damage while the effect is active.
 
 
I found that even blinks stack the effect but it’s probably easiest to use Mark of Flame so that you can hit multiple enemies at the same time. It shouln’t take too long for you to stack up to 100.
 
 

 
 

 
 
This is all for Kingdoms of Amalur: Re-Reckoning Black Hole Hidden Achievement Guide hope you enjoy the post. If you believe we forget or we should update the post please let us know via comment, we will try our best to fix how fast is possible! Have a great day!