//Created By Dark Omega
//Place in the OnDeath spot of each creature specified below
void MyCreateObject(int nObjectType, string sObj, location lLoc)
{
    CreateObject(OBJECT_TYPE_CREATURE, sObj, lLoc);
}
void main()
{
object oArea = GetArea(OBJECT_SELF);
string sObj;
switch (Random(1))
    {
    case 0: sObj = "singol";//resref of creature1
        break;
    }
location lLoc = GetLocation(GetWaypointByTag ("NW_singol"));//Tag of the WayPoint where you want the creature to spawn
AssignCommand(oArea, DelayCommand(200.0, MyCreateObject(OBJECT_TYPE_CREATURE, sObj, lLoc)));//300.0 is the amount of time between spawns in seconds 300.0 = 5 minutes
}