Need help with ability

I am making a Helms Deep map, and i want Legolas to have a multi shot ability, level 1 fires 2 arrows, level 2 fires 3 arrows, and level 3 fires 4 arrows.

Also, I don't want it to be a passive ability, i want it to be either an auto cast, or normal cast spell.

Anyway, if anyone has any ideas how I could do this, eg base ability and what I need to do to it) I would be very grateful.

Thanks

Well one option is to make the arrows actually spell projectiles, like shadowstrike or stormbolt or parasite - that makes it easy. (the disadvantage being you cant base the damage off the hero attack damage, it has to be something like 50/75/100 damage with 2/3/4 arrows)

The other way involves adding and removing (or enabling and disabling) a barrage ability, while adding and removing (or enabling and disabling) the "Cast" dummy ability. This involves some tricky timing.

So which one sounds better to you?

But how u make a misslie spell hit three targets

and i dont really get the barrage thing

You use a hidden caster to fire the extra missiles. There are quite a lot of examples in the repository.

The barrage method is complicated and difficult, no two ways about it.