Vertex Painting Shader

I wanted to learn more about shaders and to practice a little bit so here is a vertex painting shader which uses height blending. I added some parameters to modify the way the materials blend together, the parallax mapping effect, the vertex offset with which you can create some kind of accumulation effect, or the edge cutout which adds more details.
The idea was to learn as many things as possible in a single project, and it made me want to do more exercises like this one.

Materials:
Blood - Entirely created by myself in Substance Designer
Tiles - Free downloaded textures modified in Substance Designer
Sand and Grass - Free downloaded textures