... and then my (spirit blade) was quicker. Ungh! So the dragon died.

So here are the details, if anybody is curious or cares. Ended up going with CL, FC, SF, and Blade, with this build. Enemies in the main part of the map were Red Templar. Used two electric tonics. I also had regen pots and bees, but didn't use them. Right before this, I made new mods for my staff.
Gear was this:
Fury of the Veil
- Superb Spirit Rune
- Inscribed Grip - 10% Attack, 5% Critical Chance
- Battlemage Blade - 10% Attack, 5 Magic
Superb Amulet of Willpower
Superb Ranged Defense Belt (it was either that, heal, or stagger)
Superb Ring of Life Drain (10%)
Enhanced Ring of Attack (5%)
Enlightened Warrior's Armor (Mind)
- Superior Battlemage Armor Arms (32% Spirit Resist)
My stats were
Constitution: 20
Willpower: 34
Cunning: 24
I don't think the build was too different than the first time I tried this and made this thread, but the mods on the staff weren't tier 3 yet (I had a mix of magic and willpower, but it was pretty low). For the dragon, I did not try to preload the trebuchet at the beginning, I just went sort of to the middle and downed an electric pot. So it was easier to get under her for SF and SB. After she took off the first time, I did try to preload a trebuchet, but she hit me with electricity and I lost a bit of health, so I just decided to avoid them after that. Dragonlings just got SF and SB over and over. She only did the wing flap thing once after a hop at ~30% health, but I had high barrier and it didn't matter.
In between then and now I also tried a few runs with a Fade Step, Fade Cloak, Stone Fist, Spirit Blade build of various levels. I don't think that build is for me. It wasn't bad in the team games I played, but I think on Arcane I like to have CL, FC, and SF and then a fourth to be determined.