You write on parchment, paper, or some other suitable writing material and imbue it with a potent illusion that lasts for the duration. To you and any creatures you designate when you cast the spell, the writing appears normal, written in your hand, and conveys whatever meaning you intended when you wrote the text. To all others, the writing appears as if it were written in an unknown or magical script that is unintelligible. Alternatively, you can cause the writing to appear to be an entirely different message, written in a different hand and language, though the language must be one you know. Should the spell be dispelled, the original script and the illusion both disappear. A creature with truesight can read the hidden message.
RollQuest summary Ritual. This spell can be cast as a ritual. The ritual version takes 10 minutes longer to cast and expends no spell slot, so it cannot be cast at a higher level; it requires a feature that grants ritual casting.
SRD 5.1, p.156 · CC BY 4.0
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Cast Illusory Script on a real battle map. Pick a caster and a target and RollQuest plays the effect for everyone at the table. Free to start.
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The builder walks you through class, species, ability scores and spells, then you cast Illusory Script straight from the sheet. RollQuest rolls the dice with your spellcasting modifier, posts the total in chat for the table and keeps count of your spell slots. Try the DnD character creator, for 5e and 5.5e.