Pain Elemental Evolution Quest
Go to Astral and start the Memory Lane run. Follow the directions until you kill a pain elemental that opens a portal (sphere on ground). Enter the sphere and proceed through a short maze until you get to the leech area. Use the 'Exit' command to progress through the rooms, to The Fate of the Elementals.
The pain elemental that spawns the sphere is always along the path, sometimes as far along as Dark Queen Z's room near the end. The sphere it spawns on death remains until reboot.
After entering the sphere, proceed through the "maze" (exits are not randomized but there are 2 rooms with the same name), going through rooms The elemental Army -> rise of the dark fae -> rise of the dark fae -> the final victory -> the tide turns -> the fate of the elementals -> the fate of the elementals.
The fate of the elementals room has one sentinel mob (memory) and is an ok place to regen if needed before entering neuxs.
Next enter nexus and go down,down to land in a roughly 5x5 square area.
Kill all of the leeches withing a repop (about 7) to spawn the pain essence ticket. You can track them.
Wander around until you find the room called PAIN with a doorway. This room is noregen but is lloydable -- you can set anchor here, regen on thorngate, and come back if you like.
Enter the door and go north, 3w until a dead end. Enter the door (private) and give the essence to Scorn.
To leave, go 1 east to rejoin group. Head east until you hit a dead end and enter the inferno to talk to Hatred. He will open a door for you back towards Scorn's direction.
Return to the room with the Residues, a door will be open to the north. Enter for a fairly large fight. Loot the Power from the ground after the Overseer dies and bring it back to Hatred to unlock Pain Elemental evolution.
Note! The entire area after the inferno is NOREGEN. Play it smart and set the Anchor before attempting to regen for the final fight.