Circle of Power: Select random hero Can I get a little help with making such a trigger please? :)

Yes. Set hero type 1 to be variable 1, hero type 2 to be 2, and so on and so on, and then make a trriger that would pick a random number when someone enter the place and spawn hero that's variable number is same as picked random number.

What variables should I use then?

Unit types (Heroes you want to be selected randomly) as variables.

I still can't figure this out.. how to make a trigger that makes you pick a random number?

And the unit variables, should I make the variable size equal to their number?