[Trigger] Another question concerning a trigger

[Squiggy]

Hi folks ^^

I discovered another problem which makes me upset -.-

What i want to do is:
Creating a trigger which checks, if a unit belonging to a certain race [you know, a race in a maul like Crystal or Fire] has a buff (Damage Aura) and if it has, removes the buff.

Like:

[Unit of race A] <--- [Damage Aura]
{Unit of race B} <-//- [Damage Aura]

So, if i take first Race A, which contains the aura, the towers are affected by the aura. Thats ok.
But if i later take another race, which doesn't contain the aura, their towers mustn't be affected by the aura. But is is, however.

Is this even possible ? Or am i blind and its way easier than i think ?

Well, my trigger is this one:


I hope, one of you can help me doing this

Regards

 

[Ghan_04]

What event is that there in your trigger?
I can't read that.

 

[Squiggy]

Oh sorry.. forgot to translate it.
It's "Unit - A unit finishes construction"