Much like with Sitonai, I don’t disagree with the meat of their review but just with the ordering of their skill levels. I view S2 as the most important skill to level for Shuten precisely for the reason they say to leave it for 2nd- it lasts 1T and has a long CD, so you want to level it to have it ready as much as possible.
For S1, t the Crit chance down has really big values, higher even than a lot of Assassin enemies will have (30% seems common? I know I’ve seen a chart for it somewhere, but don’t have it on hand). There isn’t any scaling for the NP seal’s chance of success, so I’d recommend leaving the skill at level 6 for the first CD reduction, since a 40% subtraction to most Assassin’s crit chance still leaves them in negative numbers, meaning it won’t happen.
S2 is…both better and worse than a Mana Burst. Worse, because the value is smaller (30% vs 50% for 1 turn) while having a longer CD than normal (6T vs 5T). However, Shuten isn’t a gorilla and can’t NPBB chain, so having the Arts bonus is really nice for her to quickly recharge her NP to fire it off again. The draw for crit stars is nice, should put her slightly higher than Riders, and since crits are better for NP gen, it’s ideal here that she gets an NPAA chain with crits on both Arts cards. Please note she won’t generate stars herself, so you’ll need to pair her with supports who can provide them, either passively through skills or by their CE choice. Definitely level this skill though, you want the CD reduction so it’s ready to go as much as possible.
S3 is another skill with potential, but I’d rather they just carried over Demonic Nature of Oni instead for the 3T NP damage buff vs. the trait damage on Demonic enemies (though wow she would hit for a lot in that case). Please note, there is the “Demon” trait AND the “Demonic” trait - thankfully, the “Demonic” trait has wider coverage, including enemies like Skeletons, Werebeasts, Ghouls,
scary calamari Sea Demons, Lamia, Ghosts, some spellbooks, Demonic Boars, Crabs, Bicorns, Hydras, and Soul Eaters (a commonly annoying Assassin midboss), while also including all the “Demon” enemies, and includes a few servants such as Tomoe, Ibaraki, Yu, Shuten, and…Summer Melt for some reason? No spoilers for me for Summer 4. If you’re looking to save Lores leave this skill at level 9 and you’ll be fine.
Skill (and Ascension) Mats:
She’s a Welfare, so her Ascension mats come from playing the event. Skill mats are a nasty mix of Bronze and Silver (no Gold mats required at all!)
These are not friendly mat requirements, apart from maybe the Stingers. We get 10 Bones in this event, then 3/box in the Christmas lotto. 30 Stingers now, and another 3 from Christmas mission rewards. 21 Feathers here, 3 from a mission reward at Christmas, and finally 20 Steels in the shop here, and 3, again, as a mission reward at Christmas. (Oniland has 2 nodes that drop Bones, and nodes for Stingers and Feathers as well, while the raid drops Steels)
Mat Farming Locations and (Approximate) AP Cost:
You could try to farm Bones and Feathers at the 20 AP Archer daily if you’re literally insane, since Feathers have a drop rate there of 2,740 AP/drop. Yes, 2,740 AP. No node drops a combination of her needed items, so you will have to farm all of these individually.
Bones: Unknown Coordinates X-G (Fuyuki): 2,538 AP
Stingers: Field of Reeds (Babylonia): 3,024 AP
Feathers: Town Hall (Salem): 2,856 AP
Steels: Castle of Snow and Ice (Gotterdammerung): 3,234 AP
Total: 11,652 AP///41 Days (Natural AP regen)///83 Gold Apple Refills.
Verdict: If you’re not a completionist or a die-hard fan of Shuten,
what’s wrong with you? leave her at 6/10/9. If you have other strong Casters (Illya, NP2+ Sanzang, NP5 Summer Umu maybe) and you don’t see her getting much use at all, 4/10/6, sure. But I know for my friends who play, and myself, high HP Assassin bosses are among the worst enemies to deal with, and Shuten just hits so, so hard with her NP that she’s almost certainly going to be your hardest hitting Caster too (unless you have NP2+ Illya or NP4+ Sanzang, or NP2+ Alter Egos like Melt or Sitonai), so I’m sure you will get some use out of her and you might as well put some investment into her.