Languor

Initiate/body and soul
Level/School: 5/enchantment (compulsion)
Range: close (25 ft. + 5 ft./2 levels)
Target: one object or creature/level, no two of which are more than 30 ft. apart; see text
Duration: 1 round/2 levels (D)
Saving Throw: Will negates
Spell Resistance: yes

You channel shadowstuff into the subject's shadow, literally weighing him down under its weight.

Languor functions like either the spell slow or the spell hold monster. You choose which version you want before the effect begins. If you choose hold monster, the mystery can affect only one subject.