Is it possible to make a wall-type skill?

I mean, something like shockwave or breath of fire, but that looks like a wall...Know what I mean? a kind of wave that damages everything it touches...Breath of fire WOULD work...But the projectile art doesnt. What I want to do is make a projectile art WIDER. Is that possible?

I imagine you'd have to edit the model of the effect, or create a new model. (using some sort of 3d modeling program)

GAH!
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........Thanks.