HI3 SEA - Nirvana Husk Nihilus (Clock - Lightning) D507 - 832 pts (833+) - LV(SSS) HoTR(SSS) GD
This is the first time a fully equipped 9S team is featured in the channel, thanks @Akayuki for providing the account =w=
The strat is pretty straightforward, but you need to do everything at the right timing, and affixes really matter (have they not been lol) on HTR and LV. Even if you have slightly fewer stats, it might affect your overall damage.
In the beginning, you do Weapon Active with HTR, then go straight to mech mode, dash to the boss for the team's +2 SP, then use her Ult. After that, switch to LV, and use her combo + WA about 2-3 times depending on your Lightning Affixes so that Kiana ELF can give debuff to the boss so that you get more dmg later on, and then use LV Ult. After the ult, you hold the weapon skill button immediately to do her finisher.
Next, you switch to HTR, use weapon+a for level 2 mech, then switch to mech mode, shoot about 2-3 basics depending on your SP regen stats, then do her combo ATK and use her Ult. During this phase, the boss can do various actions like 3 slashes, blade spin, and skating. Depending on what the boss does that you counter it in the right way so that you can get enough 125 SP for yourself (for example, when the boss is skating, you move forward a bit while shooting, and the boss will gradually teleport back to push you to the center thus you can get more SP by standing close to it).
Once you are done with it, switch back to LV to do her combo atk and weapon active to trigger her madness mode + break the 7.5 bar threshold (be careful if you do this move while the boss is doing the blade spin atk right after as your attack can miss the boss when it disappears, thus reducing your overall DMG. Avoid that at all cost). After that, immediately switch to GD as you don't want the boss to lose the weakening buff upon kneeling, then use ELF Ult in the process to reset LV CD and get QTE from GD's weapon active, then use GD's Ult to paralyze the boss, and switch back to LV to do her full sequence. Instead of doing full atk here, you do about 11 slashes, then press ult during the 11th slash so that your Ult still gets the buff from HTR's ult, and you can "cheat" a 12th slash after the finisher that will give you more damage total. This move requires precision as if you press Ult too fast or slow, either you won't get enough dmg from a full slash, or you will miss it and LV will do her finisher instead. The required HP remaining after LV's attack on the boss is about 1/3 bar of the last HP bar of the boss, any more than that and you won't have enough dmg to kill. The reason will be explained right in the next part.
After the ATK, switch to GD QTE for some damage while the boss is standing up, then switch to HTR and get full level 3 mech mode to trigger LV's QTE, then you kill the boss with her ATK and Combo (or even GD's QTE later on if you lack the damage). If you can't kill with everything mentioned, the boss will call its clone and significantly reduce your damage.
After the boss dies, switch to HTR, wait until the boss nearly calls the clone that you dash back, and use the full weapon active sequence until it's about 4-5 dots left of the third layer of the shield, then immediately switch to LV to use her Ult and finish the boss. This part also requires precision as being too early or too late will affect your shield breaking thus may lead to not being able to kill the boss or losing points (even in this video I had to add 1 more basic due to being a bit too early with the timing, without it I could get 833 already lol). Also if the clone is close it may hit you with its attack and stun LV while you switch her in, so be careful with that.
Music: Die For You (Dabin Remix)
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