Get some sp pots
Get a paladin hireling( I used the L20 Halfling)
Get a fvs hireling w restoration to heal paladin and take off your stat damage
Boss has super fast regen. Paladin hits w good damage which causes end boss to become vulnerable and slows his regen.
Keep hirelings in pocket for now. Clear out quest. Enervate mobs. Gather, use wail of the banshee/fod to wipe them. As you kill them gravity in each area lightens etc. There are various quest guides. Read them to get the gist of the quest. No need to repeat all that here. My main difficulty as a wizard was the end fight. Since you can't really damage the boss until he's vulnerable, the key to soloing it is to take an npc that can do good damage. That's where the paladin comes in.
Get to end boss, pull npcs, set them to aggressive. Basically turn on quicken, maximize, empower and heighten, stand in one spot, block and cast. I used meteor storm, firewall, disintegrate, etc. and just cycled through them.
Three times during fight a swarm spawns. Just run a wide circle through firewalls til swarm dies and resume killing boss. You may run out of sp, just chug some pots and keep trucking.
He gets stunned when the pally hits him so it's more or less just standing there dumping spellpoints till he dies.
I posted this because I wanted to farm eardwellers and got sick of waiting for my group to fill. I'm f2p so needed to do normal and hard to unlock elite so I could farm the optional for eardwellers. Couldn't find a decent solo guide so I figured I'd post how I did it :-) Seems like no one likes this quest, and supposedly it has the best drop rate for eardwellers so if you need one and play a wizard it's a snap with a couple of npcs.