Some kind of ORIENT: line is mandatory for vaults; skipping
         ORIENT: makes your map a minivault. As a rule of thumb, if
         you're writing a small random map, skip the ORIENT: line and
         make it a minivault. For special levels and (branch) entry
         vaults, you do need an ORIENT: line.

         Some kind of ORIENT: line is mandatory, unless you want the vault to 
         be a minivault. Valid values are:

DEPTH:   For random vaults and minivaults, this gives the range where the vault
         may be placed in the dungeon. Branch entry vaults can also be
         constrained by depth. E.g.

DEPTH:   For random vaults, branch entry vaults, and minivaults, this
         specifies the range of levels where the vault may be placed
         in the dungeon. E.g.

         DEPTH: does not force a map to be placed in a particular place; it 
         applies only when the dungeon builder is looking for a random vault
         or minivault, so you can control at what depths your vault gets
         placed.