I love the distortion idea! I'll test it for the next WIP, thank you! :D And I agree with you on the fact that there should be one large projectile in the center! Didn't notice that. Thank you again! :3 I'll work on that and keep you updated! ^_^
Amazing job man! Maybe you can add some impact scars on the ground around the sphere like you have done from the sphere on the left in the spell's emittion.
you might want to look into turning off the auto exposure in the camera also. You can do this by setting the min and max to 1, then adjust the bias to crank the exposure up or down. Might help for more consistent results. You might have to set this in your global post processing also, not sure. Lookin good btw!