4 Auras

I got 4 Auras, for now we call them
Blue, Red, Green and Yellow.

I want the Blue to only effect on Blue units, the Red on Red Units etc.
(Not Player Red, just classification)
How to do it?

Well, you would need to find 4 classifications that you don't use otherwise and that can be chosen in the targets allowed field and name them red/blue... two of them that I can think of are aincent and... suicidal, I think, these two are nice because you can also choose non-aincent as a targets allowed field.

I would say that a trigger is the best way in this case

Ok Ive tested these classifications.
Ancient, works
Air, works
Mechanical, works
Suicidal, dont work

How would I do this in triggers then?

well, i think that anitarf's idea is the best way.

But, if you want to do it with triggers, try the following:
a. pick all units in unit group of all units of type A within B radius of position of random unit of type C and do multiple functions
b. (apply buff D to picked unit)

dunno if that would work.

I dont think that random unit of type C would work well.
shouldnt there be any better way?
and I dont think there is any
"Pick all units of type withing <area>"

probably Pick all units in <area> matching " " and do multiplie functions

the map editer is weird like that, it doesnt have that combo.
but yeah, do as you said. you can always resort to matching conditions statements

Well as I just said I dont think that will work so well. Because if a unit leaves the aura range It still got the buff,
might be some other problems too.

Isnt there an easy way?

another classification you can use is "organic"

undead, hero, air, ground, enemy, neutral... tauren is a good one....

enemy,neutral,air,ground,hero wont work

and how to classify a aura to undead and tauren?

*bump*

*bump*

A trgger such as you said would work. Just check for matching unit types every 1 second. Then, if the unit is not within the range, just remove the buff.

Well then I assume I'll use that..
Am I stupid or why cant I find the Add buff trigger? Or how else whould I apply the buff to the unit?