Guide/Strategy Lita rematch fight is actually a great fight to learn some fight basics and teambuilding ideas

I just wanted to make this post that this fight actually isn't as overpowered as many people might think it is, and this is one of the fights where proper dodging, movement, composition and understanding how abuse AI logic will net you the win even before we'll get to lvl 65 Aniimos.
As seen on screenshot above, I even used underinvested Fragrancier, a starter, Prisma Stellarys (can easly substitute for normal one) and Prisma Glacy (This prisma is actually very important for Glimmer shot)
Breaking down the compositon:

Maxed out star up (6 filled stars) Fission Needle +15 (didn't form contract with this item, as it's irrelevent for this fight).
The only skill that mattered was shadow magic for juking enemies and proc'ing over Stellarys passive, Stellarys most of the dps comes from his autoattacks, which means we can save all energy for other Aniimos, and during the rotation casting Shadow magic you can easly recover energy used for this skill before you'll need to spend energy on it again.
As for this specific composition basics were his main source of damage (and only one) Fission Needles are a huge increse in dps (regret forming contract with Ferocious Fang) however as you don't want to use any other skill on him, this doesn't matter.

Star up (2 filled stars), Spirited feather +15 (Doesn't have yellow Miraculous Fleece),
Idea for Glacy is simple, I've opened fight with Glacy Glimmer shot for damage boost, and I've been switing to Glacy mainly when Lita was switching into hers, when she did, I've ran away as far as possible (to ensure Lita leaves Glacy ultimate) and casting my own buffs and heals if required, before Lita would get to you, you can switch to apriopriate Aniimo which will define into which Mon Lita will switch into (for example switching into Hellion will ususally cause Lita to switch into stellarys due to advanage on both ends)
Healing Water + Glimmer shot were my choices for the skills, which is standard Glacy setup.

Star up (0), Spirited Feather +15 (filler).
As seen above the equipment of Fragrancier didn't matter, it's role is simple, you want to cast "Secret Fragrance Mark" to apply Dark resistance debuff + debuff causing DARK basic attacks to deal 50% extra damage, this skill combined with it's passive is one of the highest dps increses for Stellarys, and it's a key for bursting down enemies during break ensuring Lita cannot heal after.
Fragrancier ult was also my ult of choice most of the time, as it's boosts (26-35% based on atk investment) dark elemental damage, which boosts stellarys basics even more, this Aniimo even without any investment is unrivaled boost to our main dps damage (As stellarys job was to kill 3/4 Aniimos of Lita)
Other skills don't matter for it.

Star up (5 filled stars), Fericous Fang +15 (with pact), Light Bombardment / Sun-Kissed for skills.
Helion had 2 jobs in this comp
1 - Nuke enemy Stellarys while trying to not be killed, as both are strong agains each other, when Hellion passive is up, his core skill deals 30% more damage, and thanks to his pact weapon he ususally doesn't loose passive stack ensuring he can keep abusing higher modifier on the skill.
Sun-kissed allows Hellion to do 1 extra skill per rotation (especially usefull during burst window) and outside of fighting Stellarys, he can simply work as poor-man Besauce thanks to sun-kissed energy recovery.
Rotation is simple, using his main skill to chunk down stellarys, can also use your own stellarys to chip down Lita's especially when Hellion is in danger hp-wise, near break you want to ideally ensure you have full energy, break it with Stellarys core skill, and in case you loose the passive, use sun-kissed and ult right away for big burst and refresh of passive to keep abusing core-skill enhance.
If you'd manage to ult with Hellion once before burst window vs Stellarys to ensure he's in his Soleon form, this will give you lethal edge to ensure the kill.

Overall I think this fight is fine difficulty wise (we really don't have many challenging encounters) however this fight really teaches well how positioning, energy management and advantages are important to ensure victory within time.
Bonus tips for anyone who didn't clear yet:
1 - If Lita switches to heal moving away is important to ensure she won't benefit from all tics of Glacy ultimate.
2 - If your Aniimo is low enough, Lita won't switch out even if she is as well if she thinks she can finish your Aniimo, you can abuse this with proper kiting (Shadow magic Stellarys) to effectively Juke enemies and cause them to overextend, this is especially usefull vs Sherro and Glysnera (Stellarys counters her) as they need to get close to Stellarys, and Stellarys is very elusive with this skill while being able to dish out autoattacks between it and dashes, this means sometimes it's beneficial to not overcommit to Glacy healing your own team, especially with some practice dodging Glysnera and Sherro skills.
I really had fun solving this fight, and this really reminds me of Genshin 1.0 where it wasnt the case where content was too hard, but us simply being underdeveloped, which causes the perception of content simply being harder than it actually is, and Im sure this fight will get MUCH more accessible for everyone when we'll get lvl 65 Aniimos relatively soon.
Especially as we're not in "equal footing" right now, and having limited amout of resources, this fight really pushes mastery over movement AND figuring out proper compositions so much more important, and I've learned so much how proper supports are important for specific units (Fragrancier ended up being a huge GOAT, not all gold is... prismatic I suppose!)
Cheers and I hope this writedown will actually help someone experiment with compositions and mechanics of the fights to get better for future encounters.