Cost per tile: 350
Health per tile: 1000

Monster Attracts:                    Size Needed:                  Also needs:
Dark Mistress                                  9 tiles                           Lair

  The Torture Chamber has several useful functions. You can punish unruly minions, get information from the enemy and convert enemy troops and Imps (for more info, see the section on the hatchery). Ghosts will occasionally be released from those that have died at the hands of your torturers.
 Torture can also be used to cheer up an annoyed Dark Mistress. Simply drop her in the chamber and let the attendants do their magic. Just make sure you take her out before she dies.
(While you're at it, make sure you spend a little time dropping each creature type  into the Torture Chamber and zooming in on the action. A little sadistic pleasure is  why you took the job in the first place, isn't it?)