3 shots? I love the idea, and I think having a trident-like aura to add to your sprite would work well.
One thing I would like to know, is the frequency, projectile speed, amplitude, as well as the arc gap.
Frequency: How often it zig-zags
Projectile speed: How fast it goes
Amplitude: How wide it zig-zags,
Arc Gap: how far the bullets are when fired from each other./Its direction
Or, just tell us about its shot pattern. I'm mostly curious of that.
About the trident thing, just make sure it doesn't look too much like the Staff of Esben
Edit: Arc Gap, not degree of seperation