it might say 1000% but its a quick type therefore its effective percentage is 800%. and her arts hitting 3 times doesn't mean in any way watsoever it does more dmg than her buster. buster has a 1.5x multiplier arts 1x quick 0.8x np % does not include this multiplier yet so a np 1 buster aoe that says 300% is actually 450% for example.
UPDATE:
HA! Made it. cleaned out most of the materials in rewards trade shop. Except for some Daruma trades and the class idols. Got San[Ta] and all her power-ups too haha.
Passive star gen team can be formed even without 2030 all you need is 2 passive star generators (Hans, Liz Caster, Mephistopheles etc ) and a servant with high star weight. I actually found passive star gen team are easier to form compare to Quick team at least in NA due to the lack of cheap Quick star generator.
They add more items to the events as they become drops in the singularities. Gears and pages will drop around the time London is out. The horseshoes, we might have to wait until Camelot before they are fully available.
Leonidas has 3 turns taunt on his NP, 1 turn taunt on his 1st skill. This CE could also be put on Ruler class servants as they take 50% from most enemies.
Halloween Petit Devil advantages against Dive to Blue is that it increases NP gain not just Art effectiveness and yet you suggesting: "Best used on offensive Servants owning at least two Arts cards". There are servant with godd hit count on Quick, Extra or event Buster card.
This CE is most effective on servants with powerful self-heal ability like Enkidu or anyone tanky with multiple heal abilities like Marie, Spartacus, Medb.
I use whatever Servant is best against the class for that free quest.
As for the restricted quest, it really depends on the type of servants you can bring based on the condition
I find Jeanne works wonder with art up CE like Formalcraft since she has 3 art cards. If you are not using her in art team then Prisma Cosmos is a great alternative.
he is extremely versatile, fits into many teams, plus he is easily obtainable for most. seeing him there in almost every "best servants to work with" doesn't come as much of a surprise