• Syntax: cast sentinel
  • Level: 9
  • Class: Necromancer
  • Save: none 
            
   A necromancer of level 9 or higher can use this spell to summon a
phantom to watch a room.  The phantom will hide in the room where
summoned, during which time it will inform the caster if any players or
creatures pass by or attack it.  A necromancer can only have one phantom
at a time; casting this spell will destroy any previously summoned
phantom.  Phantoms summoned through this spell remain for a day or more,
depending on the level of the caster.

such as "spell" or "MUD Basics"