Modified Shockwave problems

I want to make a modified shockwave but have it be like a bullet, so that once it hits something the animation dissappears, or if it his a wall or a tree or something that it stops and doesnt go through it.

Is there anyway to do this?

Just offhand, you could make a trigger spell that creates a modelless unit with an immolation-like ability, or maybe the Sapper "Kaboom!"

Order the unit to move in a straight line until it gets near an enemy unit, and then explode it and do your damage.

The only problem with this is, unit move speed as it wont move as fast as projectiles.

I wish there was a way to make projectiles be units.