Geas, Lesser(Player's Handbook v.3.5, p. 235)
Enchantment (Compulsion) [Language-Dependent, Mind-Affecting]
Level: Bard 3, Celebrant of Sharess 3, Emissary of Barachiel 3, Sorcerer 4, Wizard 4, Sha'ir 4, Spellthief 4, Initiate of Lendys (Feat) 4,
Casting Time: 1 round
Range: Close (25 ft. + 5 ft./2 levels)
Target: One living creature with 7 HD or less
Duration: One day/level or until discharged (D)
Saving Throw: Will negates
Spell Resistance: Yes
A lesser geas places a magical command on a creature to carry out some service or to refrain from some action or course of activity, as desired by you. The creature must have 7 or fewer Hit Dice and be able to understand you. While a geas cannot compel a creature to kill itself or perform acts that would result in certain death, it can cause almost any other course of activity. The geased creature must follow the given instructions until the geas is completed, no matter how long it takes.
If the instructions involve some open-ended task that the recipient cannot complete through his own actions (such as "Wait here" or "Defend this area against attack"), the spell remains in effect for a maximum of one day per caster level. A clever recipient can subvert some instructions: For example, if you order the recipient to protect you from all harm, it might place you in a nice, safe dungeon for the duration of the spell.
If the subject is prevented from obeying the lesser geas for 24 hours, it takes a -2 penalty to each of its ability scores. Each day, another -2 penalty accumulates, up to a total of -8. No ability score can be reduced to less than 1 by this effect. The ability score penalties are removed 24 hours after the subject resumes obeying the lesser geas.