This VFX was made in Unity using Shader Graph, VFX Graph and particle systems.
The Idea was to make a character that's able to make objects (weapons) with blood. Here he is pulling a blood kunai from inside the arm/hand using a small pointy knife in his finger to get access to his own blood.
The arms model was downloaded from Mixamo, but all the animations were made by me.
The kunai and "finger knife" models were made by me, with all the other textures.
Made sure to keep low batch use with performance in mind