I tried the initial quest with her in the arena the other day and just straight up strawberry floatin' died I've got high fire res and still got wiped within seconds of her nova, at least with Teostra if you're too close you can superman dive through it but with Lunastra by the time you get back on your feet most of your health bar is gone and there's no time to heal. Also the special arena is wayyyy too small for that fight, can hardly feckin move for all the fires. Might have to ditch my first-time-solo-it rule and bring in some help.
For the first battle make sure you just jump into a online session, Hang back and support via healing . If you have a sleep build use that and then everyone can multi mega bomb her.
I've now crafted all her armour and got a new set of dual blades and a very shiny switch axe.
Also one really interesting thing I only recenty learned is that you can control when she does her super attack. When she is all charged up and has a lot of blue Sparks on her. Flash bomb her and she will go into meltdown and do her super attack. It's worth doing when your ready to run away.
I've beaten the tempered version too and she isn't too bad once you have good fire resistance and attack in a good group. I use a bow build and just get head shots while healing others and keeping my distance.
The new weapon and the B armour sets are excellent. So many slots on the armour that I've run out of good gems to use and have to put some crap in there.
Need to get the bow built from her and then it's just a lot of upgrading.
Don't know if they'll be grabbing stuff from 7 or 8 as it's specifically a XIV event, and XIV is actually missing most of the ones you'd use outside of concepts (the Garlean empire use gunblades, though they're more like sabres than what you'd expect) and limit breaks (the generic melee one uses the Buster Sword to use Braver).
My bets would be the XIV artifact or relic gear for classes that have analogues in MH. Like S&S getting Curtana and the Holy Shield, Insect Glaive getting the Gae Bolg, etc. Dunno what they'll do for lances, might just make them Behemoth originals.
If the hammer isn't a goldsmith's hammer I riot.
Nero's badass mech hammer, and I'll pout a bit, but still be content.