Minus Damage/Armor Aura help

[Maverick_Agent0]

I am working on my map, Advanced Dalaran Wars, and I was starting the abilities for another hero, when I decided I would like an aura that subtracts damage and armor from enemy units/heroes. I looked at the Creating some basic abilities tutorial and the Basics of Trigger enhancing spells and still couldnt figure it out.
The Aura: Ghost Aura
What I have figured out:
1. I made 3 buff lvls for it
2. Made a variable for the unit that will get spell, but can't get this working with the trigger of a unit entering range of unit trigger.

 

[apocalypse_dude]

do one command aura with negative damage which affects enemies as a 3 level hero ability and do one armor aura with negative armor as a units ability
Give the command aura to the hero
Do a trigger that gives the hero the armor aura if he learns command aura and then adjust the armor aura level so it equals the level of heroes command aura

 

[Maverick_Agent0]

i tried settin them both as negative, it just goes to 0...

 

[Daminon]

In the main menu there is some thing called preformance I think and there there is a check box for allow negative numbers.

 

[-Nosferatu-]

i tried settin them both as negative, it just goes to 0...

Shift+Click and u will be able to put any value u want if I'm to mistaken.

 

[Maverick_Agent0]

ok so i made the two spells but, how do i make the devotion aura lvl up wen the command aura is lvled? make 3 devotion auras with different amount decrease and add triggers for each time he lvls abil so that he gets the better one? or is there an easier way?

 

[apocalypse_dude]

you can udjust the level of an ability via unit - set level for ability or sumthing like that it is one of the last unit - triggers

 

[Maverick_Agent0]

for some reason this is targetin my allies still. i switched the units targeted, uncheckin allies n self n puttin in not self and enemies, but that didnt work

 

[Maverick_Agent0]

the armor part also isnt workin.
Any1 have any suggestions? this is holdin me up and i still cant figure out wat else to chage for it.