I rigged and animated the monster hand in Houdini. I converted the mesh into a low poly version transfering the details from the high poly one on the base color, normal and ambient occlusion texture maps. I also simulated the ground fractures in Houdini and I exported it as a skeletal mesh in Unreal. I used Substance Designer for generating noises textures and I spawned each partcle using the Unreal Engine Niagara system. The hand mesh is made by: https://www.badking.com.au/site/shop/organic_custom_brushes/monster_arms_handsmega_monster_brush_pack/