Does anyone recognize the effect in this video?

[ESSOL]

Not sure where to post this but whatever

Does anyone recognize the effect that shows up in this video at 3:36: (the purple effect)

Never seen it before, and I've tried digging several characters to see if I can find anything similar to it but nothing (note that I can't get it from that character since that character is lost)

I also took some screencaps if it helps identifying it

Any help would be greatly appreciated