It is not until the doors roll open that you all realize just how many ghasts there are outside.
Let's put it this way: a fuckton might be considered perhaps what the people merely keeping Detect Magic up can see. Those of you who can see the invisible cannot see where the mass of undead ends and the ground begins anew.
[spoiler]
Will save for the first ghast. (1d20+6=17)[/spoiler]
The ghast Kyx attempts to leap into almost manages to resist the invasion, but by the time the spell is complete, Kyx can see the look on his companions' faces as the doors open.
Six seconds later, Matsuko flies out of the barn and opens fire. Where some of her bullets land, massive fireballs bloom. She manages to partly clear the path ahead with those massive explosions.