Anyone who is struggling with the demon queen boss, I just beat her and have some notes:
-Bring stamina potions, excitement potions, focus potions, and hp of course.
-Vigor uplift and haste are your friends.
-Repeated knockback skills + regular damage will stun her. Other than fragile she is immune to everything else.
-Her attacks are extremely wide. Unless you have far reaching jump or dash skills, you will get hit. This is where focus potions come in when you can't dodge.
- Bring multiple weapons with different elements, since she will bring up a shield of that respective element. If you keep hitting her with the same element after the shield, she will bring up her reflect shield.
- You only need to get rid of one crystal. Alternatively, you can just throw a swap potion so the AOE doesn't hit you. You don't need to bring many swap potions, since she gives them to you a lot.
-She is resistant to curse sword. However, curse sword armament has 40 base block rate which can help save you, also curse freeze as well. Soul drops are mainly for this and whenever she one shots you.
-There is no bonfire before the boss.
I was level 27 with a decent-ish setup when I fought her. I mainly used haste + vigor up lift to spam knockback skills and transpierce to dodge. Once stunned, I used a high dmg lvl 5 skill to beat on her. I'm not sure if this is the best strat (Could have had lvl 10skills and went in lvl 38+ but too much grinding for me), but it worked. Now, time to farm for the last section.