4 chain missile as attack? D2 skill (finger mage)

Well, the title describes it real bad.
I will just redo it;
This night, like all usual nights, i get my daily stunning spells ideas and such, during the part of the day when im in my bed, i get weird ideas, this night it was to remake the Finger Mage (go here to see the official info about this monster )'s attack...his attack is that he launches a determinated amount of missiles draining mana, but that's not important.
What i want is that a hero ingame, have no attack, but only this spell...
He throwes 4 homing kinda slow-moving missiles, that's all i need...but the problem is that he must not have a normal attack...
there is let's say...3 levels...so damage will improve per level..
anyone got ideas how i could make this? i think it requires needs of the awesome triggers.
the 4 balls must be releashed as ingame...

thanks for reading this, this, or the whole thing :P

You could create a dummy unit and trigger it to create the dummy unit and order it to shoot an enemy when you use an ability like Storm Bolt with 0 stun and 0 damage without missile art.

oh yes that could be a good idea ill try it

isn't there a way that his default attack is the skill i described? it may get annoying to always use that skill..
his default attack could throw the 4 msles with about 3 cooldowns betwen each..

Just make the trigger which creates the dummy unit fire whenever the unit attacks.

oh yes. that's logical, thanks. i understand it now.
do you also know a way how to add 10 mana to the mage for each missile that sucessfully hitted someone? it's not something required, it would be extra for me.. :p your help was complete enuf

oh nvm, ill make the caster casts a spell so it steals the dummy's mana..