To finish up the guides for the battle quest only challengers, I will be informing you about the villain from the Luminaire 2012 plot: Unstable Snow Fairy!
This was actually the first “impossible” difficulty plot challenger I’ve beaten (and for overall challengers). Do note that like Sophie, she is really more a high tier 10/low tier 11 challenger rather than a true tier 11 impossible like Malerias Familiar. Stealing is disabled against her. Here are her stats:
Her stats are not too much different than those of similarly difficult challengers like Mad Scientist or Raging Storm Sylph. Actually, she should be easier than the four challengers you fought getting up to her in BQs. Here are her weapons:
Combustible Fairy Dust: 15 or 25 fire, 15 ice, 20 magma
Blocks 2 dark, 2 earth, 2 light
Erratic Flight: 8-16 ice, 8-16 light, 3-30 wind
Blocks all earth
Gauzy Wings: 10-20 earth, 10 or 15 ice, 15 wind
Blocks all fire, all physical
Wicked Scratch: 5 or 9 physical/fire/dark/water, 15 ice/earth
Blocks 5 physical
Glassy Stare: 15 ice, 5-10 magma, 5-10 water
High chance of freezing
Tangled Curls: Blocks all of everything except ice
Most, if not all, attacks will activate Blizzards Embrace blessing (blocks 100 ice, 3 water, 3 wind; heals 250; prevents freezing; indeterminate duration)
Although her weapons appear to be all over the place, they all do ice, so ice is the overall best block against her. Her second biggest icon type is wind. Fire is third, magma is fourth, and earth is fifth. Physical/dark/water/light are not worth focusing on. With her having four full blocks outside of her Tangled Curls, it is most likely that you will not have a weapon that can completely override her defenses. However, the only icon really worth avoiding when possible is ice due to it being fully blocked by her blessing. Tangled Curls is very annoying, but I believe she only has one copy of it, so blasting it should get rid of that problem. Glassy Stare is very likely to freeze you and she will probably use it several times throughout the course of the battle, so parched mods on your weapons are highly recommended. What offensive weapons make the best blasts depend on what weapons you are using against her, though I find Wicked Scratch to be the most universal threat of her weaponry.
When it comes to beating her, you will want to freeze her first turn. This will usually be your only chance to freeze her and from there, you can set up blasts and/or curses. Psycho Smasher scroll is especially nice to use for a freeze since you can take advantage of its ice block as a means of defense as well (and not needing a freezer item means one more space in your weapon set). Although an ice blocker is best to use, they can be hard to come by, so if you lack any, then you will probably want to use something with a heal and a strong block of wind/fire/magma instead. Some ice blockers to choose from are Ignitious (with Pandemonium in set), Ice King Clawed Gloves, Unstable Sample Syringe, and Glacial Ring. However, Paintbrush Blades is probably one of the better substitues for a lack of an ice blocker. You might find success in pairing that up with something like Blessed Trident of the Banished One, Prodigy Staff, Possessed Bow, or Malignant Rift Staff. You will want to have a variety of mage shards on you to help you in a pinch. Alongside your main scroll and your Psycho Smasher Scroll, a few Cobalt Eternal Scrolls may be nice to have. Even cheaper scrolls that can help block out her bigger icon types such as Arctic Braver (ice), Perilous Whirlpool (fire), or Typhoon of Valor (wind) can help.
With the battle quest only challengers out of the way, all I should have left are the 2013 monthly Cash Shop challengers (research note challengers). Once I finish them all, I should have everyone. Just to update, I have added links to all of the challenger guides in the guide explaining the new battle quests.