Are you thinking of<em>Illusory Script</em>PaleEnchantress?<br/><br/>Illusory Script<br/>(Player's Handbook v.3.5)<br/><br/>Illusion (Phantasm) [Mind-Affecting]<br/>Level: Bard 3, Sorcerer 3, Wizard 3,<br/>Components: V, S, M,<br/>Casting Time: 1 minute or longer; see text<br/>Range: Touch<br/>Target: One touched object weighing no more than 10 lb.<br/>Duration: One day/level (D)<br/>Saving Throw: Will negates; see text<br/>Spell Resistance: Yes<br/><br/>You write instructions or other information on parchment, paper, or any suitable writing material.<br/>The illusory script appears to be some form of foreign or magical writing.<br/>Only the person (or people) designated by you at the time of the casting are able to read the writing; it's unintelligible to any other character, although an illusionist recognizes it as illusory script.<br/>Any unauthorized creature attempting to read the script triggers a potent illusory effect and must make a saving throw.<br/>A successful saving throw means the creature can look away with only a mild sense of disorientation.<br/>Failure means the creature is subject to a suggestion implanted in the script by you at the time the illusory script spell was cast.<br/>The suggestion lasts only 30 minutes.<br/>Typical suggestions include "Close the book and leave", "Forget the existence of the book", and so forth.<br/>If successfully dispelled by dispel magic, the illusory script and its secret message disappear.<br/>The hidden message can be read by a combination of the true seeing spell with the read magic or comprehend languages spell.<br/>The casting time depends on how long a message you wish to write, but it is always at least 1 minute.<br/>Material Component: A lead-based ink (cost of not less than 50 gp).<br/>