Tomb Of Night

Master/ebon walls
Level/School: 8/conjuration (creation)
Range: close (25 ft. + 5 ft./2 levels)
Target: one Huge or smaller creature
Duration: 1 round/level (D)
Saving Throw: Fortitude negates; see text
Spell Resistance: yes

You temporarily banish your foe to the depths of shadows.

This mystery functions like the mystery prison of night, except that instead of taking Constitution damage upon failing a Fortitude saving throw to escape the prison, the creature gains one negative level. In addition, tomb of night deals 3d6 points of cold damage per round.