Spawning rules:
Can the Overlord spawn creatures in areas that the heroes have completely cleared?
This doesn't seem to make a lot of sense to me if Descent is supposed to be somewhat of a tactical dungeon crawling game. It would seem to force the heroes to spread out as much as possible so that line of sight covers as much of a dungeon map as possible which completely goes against any real world tactical logic and the spirit of nearly every paper and pencil role playing and computer role playing / dungeon hacks I've ever seen.
Are we correct in reading that an area can never really be cleared and that the best idea would be for heroes to all spread out and tackle dungeon rooms / areas all by themselves? Movement rules don't appear to let heroes create much of a human wall factor so this doesn't make much sense to me.
We are just playing with the stock set at the moment and don't yet have the expansions.
Thanks!