Someone comes along with the key, opens it and yells, "Fall out and make two lines soldiers... move it! Moveit! Movveit!"<br/><br/>Even wights with specific orders may roam on their own if left to their own devices, or if the maker of that bunch happens to fall while gathering new... ummm... recruits, I could see the whole bunch going free will until the one who created the one who created them appears to bring them back into order... I think that there is also a thing about wights not becoming "full" wights until/unless the one who made them is killed... so there are multiple choice options to lock them away. Wights can't make new wights until they become full wights, so it may be a population control. It could go... 1 wight creates 2, 2 creates 4, 4 creates 8, 8 creates 16... or, even worse... 1 creates 4, 4 creates 16, 16 creates...