Random spawn in Groups

[Drazalon]

Can someone help me make a trigger? I need a trigger that if a unit enters a region an enemy will appear in that entered region. BUT it would randomly chose an enemy from enemy groups. ALSO it would not always make an enemy appear when entered so its random.

Heres what i have hope u try to get the idea...

Area 1
    Events
        Unit - A unit enters Region 000 <gen>
    Conditions
        (Owner of (Triggering unit)) Not equal to Neutral Hostile
    Actions
        Unit - Create 1 Ran for Neutral Hostile at (Center of Area1 enl <gen>) facing Default building facing degrees
        Unit - Create 1 Ran for Neutral Hostile at (Center of Area1 enm <gen>) facing Default building facing degrees
        Unit - Create 1 Ran for Neutral Hostile at (Center of Area1 enr <gen>) facing Default building facing degrees
        Unit - Move (Triggering unit) instantly to (Center of Area1 spawn <gen>)
        Wait 2.00 seconds
        Camera - Apply (Current camera) for (Owner of (Triggering unit)) over 2.00 seconds

Also at the begginning of the game i would like to set the monsters like in a "folder" (maybe a unit group?) Like set a murloc and harppy in one group. Then it would automatically spawn 3 units into those 3 regions. One enemy in each region.

+REP for helping

 

[phatal]

What I have here is a path with 3 areas marked by torches. When entering these areas there is a 50% chance creeps will spawn. If they spawn then there is the possibility of 1-3 of the predefined mobs spawning in that area which is random also. I've attached my test map. I didn't use unit groups I just set up a unit array for each area with a set of 3 creeps each.

 

[Drazalon]

oh ok. ill go take a look at it =] check for leaks or not and if all exceeds then u get ur reward.

 

[phatal]

It's not leak proof. I just threw it together real quick.