Path of Exile: Fall of Oriath has changed the locations of the Trials for the Labyrinth for everything above Act 4. The updated locations can be found here.
|Piercing Truths||Lower Prison|
|Crippling Grief||Chamber of Sins – Level 2|
|Swirling Fear||Crypts – Level 1|
|Burning Rage||The Crematorium|
|Stinging Doubt||Imperial Gardens|
(I only have a problem with the Trial of Lingering Pain, as it is not in the regular progression path.)
After completing these 6 Trials, players can access the Labyrinth in the Act 3 town. These Trials currently have to be completed once per league per difficulty. After 3.0.0, the Trials of Ascendancy system will be changed to something new.