How can I do this effect on the floor VFX?

I saw in a youtube video a person who did an effect that I liked and I wondered what it was called and how it was done. If anyone knows him let me know. Thanks!
LINKS
https://gyazo.com/9ba96b2c41f9932b8cf4c3d6593733e8
image

most likely he used raycasting to aim and shoot the orb and to make the rocks like that he ran a for loop for cloning a randomizing the angles of the rocks