Ageing Spell

Ageing Spell, also known as the Ageing Potion, is a spell featured in BBC's Merlin''. ''It débuts in the tenth episode of the third series.

History
When Merlin needed to save his best friend, Gwen from being killed, he took on the appearance of Dragoon the Great. As intended, he had Arthur see him "plant" a pouch, before he tried to escape but was captured by the Knights of Camelot. He attempted to undo the spell, but couldn't. Gaius managed to come to Merlin's aid at the last moment. Merlin was able to reverse the spell with the potion, and Gwen was saved. ("Queen of Hearts")

To save Uther's life, Merlin used the aging spell again to help Arthur, but ultimately failed due to the reversal spell that Morgana put on Uther. (The Wicked Day)

A few weeks later, Merlin used the aging spell in order to take the Fomorroh from Morgana's hovel. However, he encountered his friends, Gwaine, Leon, and Percival. ("A Servant of Two Masters")

After Morgana's second takeover, Merlin plots to draining Morgana's power, and returned an enchanted poppet underneath her bed. He disguised himself as Dragoon in order to do so. ("The Sword in the Stone")

Three years later, Morgana used an aging spell as Hilda in order to lure Arthur into a trap with King Odin, who had a vendetta against Arthur for killing his son in combat. She later used the spell again in order to give Guinevere a poison against Arthur. Merlin later used this spell again to sneak into Arthur's chambers. (

Reversals

 * The Ageing Spells can be reversed with a potion, as Merlin used a blue potion to turn himself to his normal age.