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.
Kill all of the leeches withing a repop (about 5-10) to spawn the pain essence ticket.
Wander around until you find the room called PAIN with a gate in it. Enter the gate 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.