8E ROOM OF THE TUBES. This walls of this room emit a dim purple radiation, enough to see by but too dim for reading, for example. The twenty foot high ceiling is marked by rows of three foot wide black circles, ten per row for a total of one hundred circles.
When and if the entire party enters the room the exit back to 8A will be closed off by a falling block of stone. If any person tries to escape back out through the passage, they must roll a save vs petrification (to jump out of the way) or be crushed. Those crushed must save vs death magic or die immediately. Even if they make their save they will take 1d20+10 damage, which may kill them.
Within ten seconds of the stone block falling, a number of transparent tubes equal to the number of party members will descend from the ceiling, each depositing a purple blob with about the same mass as an adult human. These blob monsters will form into humanoid shapes and attack.
Purple Blob Things (AC 7; MV 9”; HD 1; hp 8 each; #AT 1; D 1-6; SD Blunt weapons score half damage only, immune to charm, hold, sleep; XP 18 each)
The path to Room 8F is also obstructed by a block of stone. When the last blob monster is defeated, then the blocks of stone obstructing the passage to Rooms 8A and 8F will raise. The blob monsters bodies will dissolve into purple gas. Note that this room, as well as Rooms 8F and 8G, will function equally well in reverse if the party is traveling from east to west.