Thanks for the reply. However the monstermaker entity does not have the trigger target or trigger conditions that the normal monster types have.
I've instead scrapped the monstermakers and replaced them with the usual monster types as I know this will work. I just thought that using the monstermakers would be more efficent and easier but it seems alot more trickier to get the desired effects.
Problem is how do I prevent all the monsters from appearing until they're triggered? Or if that can't be done can I revert back to the monstermaker type and trigger each wave from a timer?