2 quick questions on my spell

2 quick questions on my spell

1.How do i make it so the trigger recognizes what the level of the ability is
2.How do i make it so that the ability DOESNT afect allies

My ability:

Events
    Unit - A unit Starts the effect of an ability
Conditions
    (Ability being cast) Equal to Virulence AOE
Actions
    Unit Group - Pick every unit in (Units in (Playable map area)) and do (Actions)
        Loop - Actions
            Unit - Set life of (Picked unit) to ((Life of (Picked unit)) - 100.00)

1. If {This is an integer}Level of Ability for (casting unit) = 1

Go look for that action or something similar.

2. Use the condition. I believe it's under one of the player comparisons. "Picked unit belongs to an ally of (Owner of (casting unit))

Please note that I am taking all these off my head, WE is not open, but I'm quite sure.

Thanks, it took a few minutes to find the 1st trigger, and i decided not to use the not-affect allies, it balances the ability out i think....