Spell of Revelation

"The spell of revelation. By which the true nature of the thing may be revealed."

- Merlin to Gaius

The Spell of Revelation is a powerful enchantment used to reveal the true nature of things. It works best when applied to objects, but can be used on living creatures as well.

History
When Uther announced his intentions to marry the Lady Catrina, Merlin attempted to use the spell of revelation to expose her as a troll. Unfortunately, though she could feel the spell at work, Catrina's troll magic was strong enough to resist its effects until she could return to her room and take another potion.

While under the effects of this spell, Catrina's glamour wavered and her face took on a faint yellow glow (Beauty and the Beast).

Trivia

 * Merlin may have used another spell of revelation while experimenting with the Avalon Vial in The Coming of Arthur. A loose translation of one of the spells ("Yerihtlaech me.") he used is: "True form, what is right for me?"