Breath of Fire

How can I make Breath of Fire, shoot in a single file?
this is how it is normally: ( The "1" represents the spell shot)


X1111111X
XX11111XX
XXX111XXX
XXXX1XXXX

And this is how I want it to shoot:


XXX11XXXX
XXX11XXXX
XXX11XXXX
XXX11XXXX
How can that be acomplished?

you use carrion swarm or shockwave

OMG, thanks so much, I completely forgot about those.
Please close this.

You don't actually have to use shockwave or carrion swarm (carrion swarm has the same AoE anyway). These have two fields controlling their area of effect: Area of Effect, and Final Area. As long as those two values are the same, you will get a straight line spell (like shockwave).