Uploaded April 2023 | Updated September 2026, 1 day ago
Yeah this is more of a midboss than an actual boss. Iku has only 500 more HP than Kanako from last stage with none of the healing crap and almost one dimensional offense; pretty much everything she does is electric element, except for the electrostatic shot + elekiter dragon palace combo which is basically just a convoluted AoE instant death (first she'll try to inflict shock, then she'll inflict 100% accurate instant death only on targets with shock). She'll use that combo on turn 1, then whenever she uses Mad Thunder (which is just random) she'll have a high chance of using it on the next turn. You can tank it with either Reimu using the status blocking barrier or Alice covering it with Little Legion (be sure to give her the storebought accessory that gives immunity to Shock first). Since Reimu's barrier has CD3 and she sometimes uses Mad Thunder on turn 2 and bust out the combo again on turn 3, I delayed it for a turn by using Aya + Private Square combo.
One other thing to note is that Mad Thunder is a Satori learning skill. It is a very strong spell (easily Satori's best attack for most of main game), and is a huge pain to learn if you miss it here, so you really want to get it. Luckily actually getting it is not that difficult; just put her in the tank slot of Poison Shield (or Phoenix Sky Dance) and make sure she has some form of electric defense and you're good to go. I'll try to showcase its power on the next boss (who is weak to electric).
Yeah this is more of a midboss than an actual boss. Iku has only 500 more HP than Kanako from last stage with none of the healing crap and almost one dimensional offense; pretty much everything she does is electric element, except for the electrostatic shot + elekiter dragon palace combo which is basically just a convoluted AoE instant death (first she'll try to inflict shock, then she'll inflict 100% accurate instant death only on targets with shock). She'll use that combo on turn 1, then whenever she uses Mad Thunder (which is just random) she'll have a high chance of using it on the next turn. You can tank it with either Reimu using the status blocking barrier or Alice covering it with Little Legion (be sure to give her the storebought accessory that gives immunity to Shock first). Since Reimu's barrier has CD3 and she sometimes uses Mad Thunder on turn 2 and bust out the combo again on turn 3, I delayed it for a turn by using Aya + Private Square combo.
One other thing to note is that Mad Thunder is a Satori learning skill. It is a very strong spell (easily Satori's best attack for most of main game), and is a huge pain to learn if you miss it here, so you really want to get it. Luckily actually getting it is not that difficult; just put her in the tank slot of Poison Shield (or Phoenix Sky Dance) and make sure she has some form of electric defense and you're good to go. I'll try to showcase its power on the next boss (who is weak to electric).










![Labyrinth of Touhou 2 Steam - vs Diamond Knight
Im not gonna make a video of every single [character]s Shadow - Abyss fights because they generally arent that interesting and except for the first few, Ill be steamrollering through most of them with level advantage to keep up long streaks. I will make videos for the unique bosses in Infinity Corridor, though.
Diamond Knight is the first unique boss in IC and shows up at 30F. It has a few physical attacks to throw around but except for the first turn, most of the time it just opts to toss a Scourge for overkill damage. If it has a debuff itll do an auto ATK buff as well; this doesnt take up a turn but DOES count as a turn so if it uses that on turn 1 it will probably throw a scourge right afterwards, at which point you mostly dont care about the ATK buff any more because its not going to make Scourge kill its target any deader. So I just tossed a SPD debuff at it and went on a damage race; it has really high defenses but low HP and vulnerable to SIL/HVY, and is weak to NTR or MYS, so a universally usable way to deal with this thing is to inflict HVY and use Iron Mountain Charge on it. Since I have Alice with her 40% defense ignore though, tossing SIL and using Hourai Doll seemed much more effective. Labyrinth of Touhou 2 Steam - vs Diamond Knight](https://i.ytimg.com/vi/xqp171ulbSg/mqdefault.jpg)