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Keywords are:  'spellgroup mage illusion'

Mage illusion spellgroup:
 dancing lights                             5 mag
   detect invisibility                     15 mag
     displacement                          19 mag
   darken                                  16 mag
   color spray                             10 mag
     prism                                 18 mag
       kaleidoscope                        36 mag

The mage illusion spells have a handful of uses, from invisibility to
creating lights and distracting enemies.  Color spray and its derivatives
are somewhat more powerful, as the light is strong enough and cast with
enough mana to become damaging in its own right.

Long duration illusions can be easily penetrated, and, save for the
displacement spell, are generally obscure.