Can You One Shot Every Boss in Dark Souls? (The Backlogs Contest)

The Backlogs accidentally left the door open so I just let myself in. Here's me having a go at that One Shot Contest all the other Soulstubers have been doing.

Huge thanks to @Johnothythefirst for creating the 3D animations!

Since I included it in the video, here is why I think Fire Surge counts as one attack: There is no distinction between pressing or holding the attack button in either The Backlog's or Vageta311's rules. Much like Fire Tempest, Fire Surge factors in buffs from BEFORE the first cast. This means if the first cast didn't have the Red Tearstone Ring buff, even if the player's health later drops into the appropriate range the buff still won't be applied to any subsequent casts. Something something, Pannenkoek2012's Half A-Press Theorem.

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MUSIC USED:
Searching for the Answer - Kirby Squeak Squad
Dynablade Overworld - Kirby Super Star
Madamada yoyuu! - Assassination Classroom
cartoon running sound effect type beat - xonthebeat
Bubblaine - Super Mario Odyssey
The Only Thing They Fear Is You - DOOM Eternal
Wii Shop Bossa Nova Cover - kuribo98
Dummy! - Undertale
Normal Battle (Stuck in Amala) - SMT3 Nocturne
Quartz Quadrant Present (JP) - Sonic CD
It's Showtime! - Undertale
Large Map - SMT3 Nocturne
Dogsong - Undertale
Woody Woods - Mario Party 3
On the island - Baba Is You
King Dedede's Theme [Eurobeat Remix] - Dominic Ninmark
Elite Four Battle - Pokemon Black/White
sans - Undertale
Special Stage Emerald Challenge - Sonic Heroes
Break The Targets - Super Smash Bros. Melee
DIMENSION ZERO - Megadimension Neptunia Victory II
Have a Nice Talk - Mario and Luigi Bowser's Inside Story Remastered
Seven Sages Battle - Hyperdimension Neptunia Rebirth 3
Abnormality Battle 2 - Library Of Ruina
Fanfare 1 - Chrono Trigger
Dead Broke - Konosuba
As Fierce As Fire - Fire Emblem Three Houses
An Ending - Undertale
Ending Theme - Super Mario World
Climactic Return - Danganronpa
His Theme - Undertale
Grandma - Nier
Slowly Yet Surely - Mario Party 4
Game Guy Minigame - Mario Party 3