The main component of this farm is obtaining 10.5k Dark Spirit Orbs. Just like in the last quest you did, "Dark Spirit Donation", get them from "A Penny for your Foughts" and if you want to, "Dark Spirit Orbs" when the Creeper Enchant drops.
As you do this, complete Vayle's "Hard Core Metals" daily quest back at /necropolis every day. All you need to do is defeat Balboa at /stalagbite. For the reward, I recommend picking Arsenic, Chromium, and Rhodium (you only need 1 of each).
Once you have those, you might also want to get 1 Palladium, which is part of an optional route at the end of this farm.
Each time you get a metal, complete its corresponding quest from Vayle to upgrade its form. For Arsenic, this would include completing "Accursed Arsenic Hex" by obtaining the following:
Dark Energy x26
Obtain these from Shadow Serpents at /bludrut4 as you complete "Dark Spirit Orbs". Otherwise, head to /dwarfhold and defeat Chaos Drows in the room where there are 3 of them (walk right).
Dark Spirit Orb x5
Complete "A Penny for your Foughts" and if you want to, "Dark Spirit Orbs" when the Creeper Enchant drops.
Deadly Knightshade x16
Defeat Seed Spitters at /arcangrove by exiting downwards from /natatorium.
Then, you just turn it in with the metal. Each metal's upgrade quest requires the same drops.
Before moving on to Step 3, you should have: