This Technique is inspired by Demon Slayer and is a off shoot of Heavenly Restriction. This Blood Demon Art is used by Muzan Kibutsuji. and basically has the ability to manipulate biology and living cells, There is 6 arts in this technique.

Blood Demon Art: Black Blood

User injects the opponent with a high amount of blood, causing cell decay

Summon Subjects

User summons 3 demons to fight for you

Blood Demon Art: Progenitor

User injects the opponent with a higher amount of blood, hoping to transform them into a demon or killing them if they are a demon… but causing cell decay

Blood Demon Art: Black Blood Brambles

User grows whips out of their wrist and begins slicing and dicing the opponents

Blood Demon Art: Back Whip Slashes

User Grows several sets of whips including arm, thigh, and back whips and slices their opponents within a big radius. along with poison

Blood Demon Art: Multi-Directional Slam

User In Demon Form Slams their tendrils down, making a shockwave

WARNING: THE SUN WILL KILL YOU, BECAUSE YOU ARE A DEMON

Demon Slayer: Anata no Boken

So this Blood Demon Art comes from My Personal Mod Demon Slayer: Anata No Boken, basically its a choose your own adventure mod with multiple different secrets and fun mechanics that make it unique to other mods like Orca's (including a upcoming addon creator)! if you like this blood demon art i highly recommend you go try it. its not compatible with Cursed Fate but its still really fun to play (im not just saying that because its my creation, legit ive spent several hours just playing runs of it)

https://www.curseforge.com/minecraft/mc-mods/demon-slayer-anata-no-boken