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touhou-labyrinth-2-speedrun

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Yukari Yakumo (Boss)

This page explains the strategies employed against Yukari on her boss fight. This includes party composition, which spells to use offensively and defensively, and how the battle should flow, which attacks to watch out for, etc. Since strategies vary greatly from route to route, explanations will be separated accordingly.

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Quick Summary

Yukari is a mandatory boss blocking the stairs to 16F. She has access to many spells that have annoying side effects to them, on top of having great damage potential with her big spells, particularly after her buffs when she goes berserk. Doing this fight at low levels is easier with TRR stacking, like with Yuyuko, but thanks to her 32 TRR resistance this requires a very particular setup.

AI Script

Attack List

Strategies

Ame-no-Murakumo (NG)

Yukari is another boss we deal with by abusing TRR stacking. While she has 32 TRR resist, it’s still a coin flip to inflict it with Parsee, making it consistent enough where it’s a viable strategy. The real problem is preventing it from decaying too fast thanks to quicker recovery times with 32 resist. In order to do that, we manipulate the initiative so that Yuuka and Satori will immediately cast Beauty of Nature after Parsee, making sure the initial TRR duration is at least 70k before the ATB even starts to move.

Thanks to her being neutral to DRK, we don’t need to scale TRR that high, which is a godsend given that every turn she has a 40% chance to cast Black Universe on a random spot. That means 1 in 5 turns will be spent reducing Yuuka or Satori to 1 HP, forcing you to scramble to heal them before her next turn, since any AoE attack will KO them. The TRR duration must be around 532 thousand to 1.5 million. Some details on how to get to that number:

* Jealousy of the Kind Formula = 2.5 * (ATKF - DEFF) * (1.0 + (0.01 * (TRR / 2500)))
* Spell level 5 multiplier = 1.2
* Final Blow multiplier = 1.32
* Flames of Jealousy multiplier = 1.3
* Herb of Awakening multiplier = 1.36
* Youkai Buster multiplier = 1.2
* Affinity multiplier = 1.0
* Yukari's HP = 480000
* Yukari's DEF = 6400

Final formula:
TRR = (HP * 250000 / (ATKF - DEFF)) - 250000
TRR = (120000000000 / (ATK * 17.5032 - 22405)) - 250000
	* (Without Youkai Buster active)
TRR = (120000000000 / (ATK * 21.00384 - 26885)) - 250000
	* (With Youkai Buster active)

Where (without Youkai Buster):
* MULT = Product of all multipliers = 7.00128
* ATKF = Parsee's approximate ATK * 2.5 * MULT = ATK * 17.5032
* DEFF = Target's DEF * 0.5 * MULT = 22405

Where (with Youkai Buster):
* MULT = Product of all multipliers = 8.401536
* ATKF = Parsee's approximate ATK * 2.5 * MULT = ATK * 21.00384
* DEFF = Target's DEF * 0.5 * MULT = 26885

ATK formula:

* BASE = floor((Level + 4) * (Base + Subclass + Gem + Skill + Equip-G) + 4)
* ATK = BASE * (1 + Equip + (LevelBonus * 0.03) + (Library * 0.02))

Where:
* Level = At least 46, usually is 47
* Base = 11.4
* Subclass = 0 (Monk)
* Gem = At least 7, could be 10 = 1.4~2
* Skill = At least 0, could be 5 = 0~1
* Equip-G = 0
* Equip = At least 2.28, could be 2.72 (Cinderforge + Glaive x2)
* LevelBonus = At least 45, usually is 46
* Library = At least 170, could be 200

Best case: floor(51 * 14.4 + 4) * (9.1) = 738 * 9.1 = 6715
Worst case: floor(50 * 12.8 + 4) * (8.03) = 644 * 7.57 = 5171
With a 20% buff: 8058 ~ 6205
With a 50% buff: 10072 ~ 7756

Solving for ATK values (no Youkai Buster || with Youkai Buster):
* 5100 -> 1545k / 1167k / 827k || 1246k / 931k
* 5300 -> 1456k / 1100k / 778k || 1172k / 875k
* 5500 -> 1375k / 1039k / 734k || 1104k / 824k
* 5700 -> 1302k / 984k / 694k || 1043k / 778k
* 5900 -> 1234k / 933k / 656k || 987k / 736k
* 6100 -> 1173k / 886k / 622k || 936k / 696k
* 6300 -> 1116k / 842k / 590k || 889k / 660k
* 6500 -> 1064k / 802k / 560k || 845k / 627k
* 6700 -> 1015k / 765k / 532k || 805k / 596k

Note how different the thresholds become depending on what investment Parsee managed to get throughout the run, specifically if the Cinderforge Sword is available and how many Gems and Training Manuals were acquired. The values for with Youkai Buster omit the 50% buff as going that high up requires two buffs, which poses a great risk of Sanae dying and making the previous threshold goel unreachable. The five different outcomes can be interpreted as such:

As you may notice, the main line is to get Yukari to the Youkai Buster + 20% buff threshold, and setup the appropriate frontline for the final blow. If Sanae dies while this is ongoing, the Last Wish buff makes it so Parsee can still one shot Yukari immediately, since the no Youkai Buster + 50% buff line has a lower threshold.

A faster side line is to go for 1 extra Beauty of Nature after hitting the threshold, so that Parsee can immediately go for the kill after receiving Herb of Awakening and having Sanae in front. And finally, the line where Sanae dies early ahs a riskier component that relies on alternative buff methods, and a safer one that just has a higher threshold.

The fight itself relies on a very specific early setup to make sure TRR sticks to Yukari, by classing Parsee, Satori and Yuuka to Monk, and Aya to Strategist. This gives us the highest initiative odds to make sure the three can get a move in before the first ATB tick. Yuuka getting Extra Attack procs helps immensely to make sure TRR doesn’t decay initially. From there, it’s as simple as surviving as best as one can before reaching the threshold:

PHASE 1 - TRR Proc

Having Parsee, Yuuka AND Satori with a full ATB is mandatory to make the setup work. Aya can DGA one of them with her free initiative to ensure the combo is pulled off smoothly:

PHASE 2 - Beauty of Nature

Here we simply stackc TRR as high as we can, stopping around the corresponding threshold for the gems and equip situation for the optimal setup. IA pivoting and careful healing/buffing is essential here, with Kourin abusing his Form Change skill to get Sanae in to heal in an emergency. Aya can bring further initiative to Yuuka, and Cirno can slow down Yukari slightly with Blizzard Blowout:

PHASE 3 - Jealousy of the Kind

Make sure you have everything ready before firing off Jealousy of the Kind - if Yuyuko survives you lose everything as she sweeps you with her strong spells:

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