You will solo the OOA zone in Moors.
It should take about 30 minutes to do.

Clear the first room.
Invis past the second room.
Train past the hall and then when you are in the Kierax the Energy Wielder room, go to the other side of the room to break the encounter.
Target the named and use Phase to teleport to the bottom of the pit.
The orbs can not reach the named and you will not get hit by the AoE.
Now you will go down and hug the wall to avoide the portal.
Drop down another time and your spells should be able to hit the named.
If they don/t just hug the wall and walk to the other side of the ledge.
You can then use 3 of your spells that are in range and kill the named.