Yes I also believe it is something to do with the effect shader, as well as the ' Hit effect art ' of the magic effec. The hit effect art object I believe is where the animation* is at. You might be able to fnid something similar in those big magic mods, then all you need is to gain permission from the creator of that effect, and so you can customise it to make it look like blood. If not then you will have to make those nif(s) yourself. PS. I am quoting what Di0nsys said cause that would probably be how I would do it if I want to have this blood effect.