Dynamic Texture/Normal Shader.
Shader designed to allow animators get more detail out of there work, with the combination of texture assets.
This shader has the ability to blend between two, like in this example relaxed and contracted hand, the knuckle skin folds smooth out under tension like how they would in real life.
The shader is infinitely expandable and can be combined with a custom tool that can handle these dynamically, and example of which can be seen here : https://www.artstation.com/artwork/k4...