Change it then

===>
webm is absolutely amazing, quality and size improvements over FilmStrip and Animation are almost frighting

I just rewrote the class a little bit so I can add the webm without a loop.
I will push the first test case soon but I think that we'll use it for all new attacks in the future. I'll leave the both, the old and the new Cataclysm attacks.
Ren'Py will have to be updated to it's prerelease channel or crash is assured.
=====================> Edit:Man... it's sick! It takes seconds to convert gif to webm using online converter, there is no need to remove black background because Ren'Py does that for you and quality is amazing while the size is almost two times smaller than the original gif, forget our filmstrips, at this quality they took 40 - 90 MB, webm takes 1.5 MB

and no need to mess with rows, sizes and timings.
And it's possible to put the sfx in the file... this is possibly one of the coolest things happened to Ren'Py in graphical department in a very long while.