I just beat it recently. I took screenshots of about 2-3 fails where I had him down to 8%, and even less I think. Then I beat it and erased all those pictures, but kept the one that counts:

On a Nord Sorcerer lol. Paraphrasing my pal: "I'm not busting balls, but it's about time you did it "

@ArchMikem - I did crystal phase by throwing the ground dots at one crystal, then focus another, heavy attacks if u need sustain only on first wall. Switch to Overload, go downstairs and kite-nuke the Crem Guard with Overload. Save the defense, power, and haste sigils for the end phase. Second time up, I would also use overload to finish off the crystals if I got to the second wall with low resources. Lightning form for free dps on crystals near you and speed.

I used Destructive touch instead of frags because of the knockback/stun for summoners and the dot on crystals.

I hated memorizing it, it's like some kind of deadly choreography. Wrong step/lag bs and back to the wayshrine. I literally jumped for joy when I finally did it though. VMA teaches you to keep your cool when things get hairy, or die. VWGT HM will feel like FG1 after this.

If you got there, you can do it, and you will.