Malenia in True Oneshot per phase with Zweihander | Elden Ring

(Patch 1.09.1) Just to clarify, a true oneshot is when you defeat a boss with a single hit. Since Malenia has two phases, this means one hit per phase. It must be a single hit, so Comet Azur and Marais Executioner's Sword, for example, do not count since they hit multiple times (they are still considered oneshots, just not true oneshots). Now in my opinion this should be done on the current patch without glitches and offline so that it's possible for anyone to replicate it. Anyways, in order to pull this off I needed to use the strongest of each type of buff and a debuff, along with landing a piercing counterattack to activate the spear talisman. I used a Flame Art Zweihander with 99 str/dex/fth to maximize damage. Hope you enjoy!

Added a description of the buffs from my reddit comment:
These buffs are similar to my previous vids but there are some slight changes. To start I use a Frenzyflame Stone to inflict madness with the Black Dumpling helm equipped, then I sort my inventory by recent acquisition and use Seppuku twice with the Antspur Rapier to bring down my health. Then I switch to the Winged Greathorn and drink my physick (which has Fire-Shrouding Cracked Tear and Spiked Cracked Tear), and after the madness is inflicted I drink a Cerulean Flask, go through the fog, and switch the Black Dumpling helm to the White Mask. Once through the fog, I use Uplifting Aromatic for its protective bubble, then I use Howl of Shabriri, switch the Erdtree Seal to the Twinbird Kite Shield, and then I move closer to her and use Soul Stifler with the Winged Greathorn. After this, I create some space from her and swap the Winged Greathorn to the Commander's Standard. I toss one Roped Fetid Pot to build up poison, then I use Rallying Standard, and then switch to the Antspur Rapier and use Seppuku to inflict blood loss. Once blood loss is inflicted, I swap the White Mask to the Mushroom Crown, then toss another Roped Fetid Pot to inflict poison. Once poison is inflicted, I swap the Lord of Blood's Exultation and Kindred of Rot's Exultation to the Red-Feathered Branchsword and Fire Scorpion Charm. Then I switch to the Zweihander, two-hand it, and use Royal Knight's Resolve. I then land a charged heavy attack which must be a counterattack. At the start of the second phase, wait half a second, then use RKR again and land another charged heavy. Its also important to note that the other two talismans I used were the Axe Talisman and Spear Talisman.