Arcane Runes

When this power is used, an Arcane—or a wizard trained in the use of their runes—can inscribe a message or longer text, hiding it invisibly within a scroll, book, or tome. The user might write a warning within a large normal or magical text, send a letter with secret information hidden between the lines, or even write an entire book within another volume.

The Arcane runes spell is similar to the 1st level wizard spell, wizard mark, but the runes do not show up when a detect magic spell is used. They can be seen with a True seeing or by anyone casting the read arcane runes spell. The race of Arcane, spelljamming traders extraordinary, can read their runes on sight; they are the only ones who can do so without specific training or magical aid.

The material components of this spell are a pinch of dried and powdered lemon and a stylus. No pigment is necessary. The caster must mouth the words (not necessarily loudly) as the verbal component. In longer texts, a single Arcane runes spell can be used, the casting time ending when the caster closes the book or scroll he is working on.

Note: Rare in the Spelljamming cultures; virtually unknown elsewhere. (Updated from Dungeon Magazine)