Here are some of the fx I created and implemented.
Procedural Lightning material. Screen shot of Material Graph
Doomish demon spawn effect.
The electricity is motion and visibility keyframed additive mesh with transparency.
The graph levels on either side are comprised of a transparency mapped grill in front of scaled polygon faces.
Visibility keyframed additive mesh with transparency and scale.
The electricity on the gears is a scrolling additive transparency..
The fireball effect was achieved through keyframed additive transparency meshes.
The power blast from Robot's chest was achieved though keyframed additive transparency meshes.