I know AoEs are expensive, but a few cloud of bewilderment hazes could give the impression of acid and leave a fading debris feeling after the explosion.
Perhaps. May play around with it.
Just an idea. You've made some cool stuff, both here and your module. If you enjoy making them, I can't imagine there wouldn't be users.
I wouldn't say I enjoy it, really. More that I needed the visuals so I created them. I don't sit around daydreaming about making visuals, I sit around daydreaming about using the visuals for something.
I think it would be interesting to see, but I don't want to nitpick. I would say a good duration would be something proportional to the time from cast to impact from a typical distance, say 20 meters. Original Hellball is visually present for I'd say a almost a full round.
Well, *I* want you to nitpick! Iterative development. I throw some ideas together that are very different, get feedback on them, and adjust stuff according or create new ideas. This is precisely the time *to* "nitpick!" I could have made all of the original visuals expanding or present for a set amount of time but I wanted people's reaction to ideas that are substantially different.
Original Hellball is about 3-4 seconds total, for reference.