[QUOTE=theubie] Add a condition to the one that checks distance. If you want it to spawn say...15% of the time, you'd use something like Compare Two Values-> random(0,100) <= 15.
Another thing to consider: This action is going to spawn everytime you run through the loop, so if that spawner object stays within the spawn distance you put in there, it's going to start popping out mobs at a high rate. The random statement I just mentioned will address that. You might want to add in one more condition to limit the number of times it can fire over a given period of time, like Every 1 second or something of that type.
(just speaking from experience there)[/QUOTE]
So add a second condition to do say random(0,100) <= 20 (for 20% spawn chance) and then a third condition that checks every 3 seconds? What would that even look like? 0_o