How do I make a barrage attack/effect?

I am trying to make a barrage attack for my game, but I can’t figure out how to make it.
I though about making it with coroutines but I cannot make it efficient and it’s very bugged. I deleted the code so i can’t show you, sorry.

This topic is not about that, but also would help if you explain me how to make a barrage effect with bezier curves or something.

Thanks for reading.