found the following on my vamps forum.
Previously, people noted that blank table counts as "open terrain", which is listed as a type of "terrain", which mean technically that you treated the ENTIRE BOARD as dangerous terrain.
The new ruling in WD claims you now only treat actual terrain pieces, as in physical things which are not blank table, as Dangerous Terrain.
this may need futher investigating.
upon further investigation in my part this was only a battle report comment, which I have been informed is not a reliable source.