Any tips for Expert Revenance please ?

[Aletheia]

I somehow got a hard time with the previous boss and managed to use all of my healing items. And I could only do 2 bobas before going to the limit use of my converting skills to get materials.
I can take down 3 health bars (since the first two are linked) but she hits like a truck and I somehow always ended up dying to the same freaking attacks.
If I could have some more healing that could be fine I guess, but I don't want to fight the previous boss again lol.
Am I F'd for not farming enough material to craft any more healing items? Because crafting items cost a loooooot.

[ChaosFred]

1. Defensive sigils like those HP recovery or damage reduction could get you a safe run through lots of troubles. Heck to the point you may just facetanking everything and even keep dropping the hole like no crap, the only offensive sigil you need would be the quick drop bounce, aerial tornado spin which allows you to cheese some of the boss moves by staying aerial near it while spinning and some MP charges. Avoid any sigil that reduces defenses or HP.
2. Have you collected (almost) all the potions? This scales with above tips and makes it really powerful.

[Aletheia]

Actually, I managed to beat her! I just needed to focus a little bit more on the first phases, strangely enough, the 2nd phase were a bit easier haha, thanks for the tips though!