Cost per  tile: 200
Health per tile: 900

Monster Attracts:                           Size Needed:                      Also needs:
Troll                                                    1 tile                                 None

The workshop is where all your doors and traps are manufactured. You want your workshop to be relatively big, with room to expand if you can't afford a lot of floor space right off the bat. Once those workers get going, traps and doors will pile up like nobody's business. As with the Library, build your workshop for efficiency. Square rooms with reinforced walls are the most effective. Take your workers out occasionally for training sessions. Bile Demons will spend a lot of time in the workshop, but should be well trained for combat. Trolls make terrible fighters, but it can't hurt to give them a little experience just in case the need should arise.
The workshop must be a certain size to build the different items. The table below gives the details.

                   Product                                     Size
 1- Traps:
                   Alarm Trap                      No Requirement
                 Poison Gas Trap                       10 tiles
                 Lightning Trap                          13 tiles
                 Lava Trap                               17 tiles
                 Word of Power Trap                21 tiles
                Boulder Trap                            17 tiles

2-Doors:
                Wooden Door                            10 tiles
                Braced Door                               13 tiles
                Iron Door                                   17 tiles
               Magic Door                                21 tile