I have developed a workable Single-Buff High Elf Build that holds its own at Gold Level 75. I tested the build in the Blood Wood with no near-death experiences, as she handily escapes the wicked Demonic Eyes. I believe that a viable play-through at Niob is likely.
I made certain to add in Skills for protection and to increase damage as much as I could. I modified The Mystic Stormite Combat Arts as follows:
Crystal Skin Glacial Mirror / Focalize / Mystic Stormite Expertise
Cascading Shroud Mist / Inconspicuous
Raging Nimbus Hurricane / Roar / Cyclone
Glacial Thorns Frost / Devastation / Fusillade
Frost Flare Freeze / Frost / Icy Circle
Noticeably absent is the Combat Art Skill Concentration and the Buff Grand Invigoration . I used Crystal Skin's "Mystic Stormite Expertise" to speed CA regeneration and loaded her armor with "Chance to Halve Regeneration Time to cut the Regen in half. Constitution Mastery was made quickly and along with selecting the other protective skills in order to keep the (self-proclaimed) fragile lady healthy.