So is the level 200 Lufenia?
I got decently far and then these orbs showed up and a few dozen turns later my team exploded.
Neat.
So those of us (uhh me) with growing rosters when Pecil comes around...given that I effectively need his entire kit aside from his 15cp, the idea is to:
Pull on his "main" banner to get as much of his kit, and dupes as possible but NOT his BT.
Pull on another banner for more characters and try to pity the BT on that banner.
Of course in order to earn the most amount of pity coins, the ideal situation would be to what, ticket his kit and gem his BT?
Never thought I'd play a gacha where there are so many avenues and currency to get what you need lol
Since you're trying the lufenia's now I'll elaborate on their main mechanic... the Orbs.
Long story short, either at the start of the fight, or for a period of time between certain hp values, Lufenia bosses will have special orbs show up above their health. These will count down with a number either every turn taken, or in some other situation depending on the requirements shown when you check the monster in fight or before the fight.
When they hit zero, they destroy your party with no way to prevent it, so you don't want that.
However, if you meet the requirements they ask for, such as dealing a certain element's damage, or remove buffs, or whatever it says, you can slow it down by stopping the count or even add a bunch of ticks to it, again depending on the requirements.
Lufenias are not only hard because they jack up the tough mechanics, but watching out for and dealing with the orb is very important. I would highly recommend bringing a character the lufenia fight specifically requires for the firsr few you do, as you will likely have them from pulling on their banner, and they'll be best equipped to counter the orb.
Later, you can get away with using calls, friend summons and other Shennanigans to overcome these mechanics without pulling or using the headliner for their fight!
So yeah, make sure your team is fully maxed out and you can counter the mechanics, bring a good support friend to help make the difference in the fight, and believe in yourself! If you can't handle it now, don't worry, just try to do more chaos content and other stuff first and try some of the earlier Lufenias through the Lost Chapters thar started featuring them, if you can handle their orb conditions.
Otherwise, not a huge deal if you can't do them for a while, take your time and you'll be ready eventually!