According to the article "The name of this spell is never given in the books." This implies the name came from a different source. Where did the name come from? If it is unnamed, then the article should specify that. --SnorlaxMonster 06:31, February 3, 2013 (UTC)

Yes check.svg Done --Hunnie Bunn (Owl me!) 14:55, February 3, 2013 (UTC)


"These spells not only increase the interior dimensions of objects, while leaving the outer ones unchanged, they also render the contents lighter."
—Description of Undetectable Extension Charms on Pottermore (emphasis mine)[src]

Is it possible Harry meant to use an Undetectable Extension Charm on his trunk to fly it to Gringotts? It would not only make it lighter as described on Pottermore, but would also provide more room in it - possibly for the gold he intended to remove from his account, or similar. The only reasoning I could think of against this would be that Pottermore also describes Extension Charms as being "advanced" (no mention of how advanced, though), but given that Harry was only speaking hypothetically and imagining bewitching his trunk, he may not have known the difficulty level of his intended charm, or may have thought it easier than it was (or perhaps it wasn't too hard for Harry, who is frequently described as being magically adept). Is this possibility worthy of, at the least, a mention in the BtS section?--Hunnie Bunn (talk) 02:19, July 10, 2015 (UTC)

Private use of this spell illegal. On the other hand, Harry already thought he would be expelled because of inflating Marge.

Also, Pottermore states that schol trunks are already enchanted with that charm. It's never stated if the wo uses of the spell would double the effects.--Rodolphus (talk) 12:25, July 10, 2015 (UTC)

*Disclosure: Some of the links above are affiliate links, meaning, at no additional cost to you, Fandom will earn a commission if you click through and make a purchase. Community content is available under CC-BY-SA unless otherwise noted.