Cost per  tile: 100
       Health per tile: 200
 Monster Attracts:                    Size Needed:                     Also Needs:
Beetle                                          1tile                                   None
Bile Demon                                25 tiles                              Hatchery
 Dragon                                      15 tiles                            Treasure Room
 Spider                                        9 tiles                                Hatchery
 Tentacle                                     9 tiles                                 Temple
Vampire                                     9 tiles                              Graveyard

 The location and size of the lair is most important for keeping your minions happy.
 Make sure it's big, and that you have two or three if necessary. By building numerous lairs, where the majority of fighting among your minions will occur, you an keep Natural Enemies apart.
When placing lairs, it's a good indea to consider the path that invaders must take to reach your Dungeon Heart, and make sure that they have to pass thru at least one large lair.  That way, any resting creatures can act as guards while they rest.
You can assign a creature to a given lair by dropping him into the lair where you  want him to sleep. This is especially helpful with Horned Reapers and Vampires, both of which can get a little testy when near others. Your lair should also be big, probably bigger than seems necessary. Breathing room keeps your creatures happy, and an overcrowded lair can lead to some rampant dissatisfaction. As a rule, your minions require only one tile for a sleeping area. The exceptions are Dragons (two tiles), Bile Demons (four tiles), and Giants (two tiles). Imps don't  sleep, and therefore don't need any lair space.