[Trigger] What is the difference between array variable and non-array variable

Yes.

I really don't know, but I think that I should.

An array variable is an variable with an "internal number" inside itself. This makes its easier to access in some cases.

Events

Unit - A unit Is attacked

Conditions
Actions

Set Unit[1] = (Attacking unit)
Set Unit[2] = (Attacked unit)
Set Unit[3] = (Random unit in (Playable map area))
Unit - Kill Unit[(Random integer number between 1 and 3)]

instead of

Events

Unit - A unit Is attacked

Conditions
Actions

Set Integer = (Random integer number between 1 and 3)
If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

Integer Equal to 1

Then - Actions

Unit - Kill (Attacking unit)

Else - Actions

If (All Conditions are True then do (Then Actions) else do (Else Actions)

If - Conditions

Integer Equal to 2

Then - Actions

Unit - Kill (Attacked unit)

Else - Actions

Unit - Kill (Random unit in (Playable map area))

yes, i know the triggers leak, but its just to show :P

Hehe. Thanks.

That's very simple now for me.