Board Thread:Questions and Answers/@comment-24.62.142.87-20140331201702/@comment-26391060-20140402225936

Put it more accurately, crystal and revival items are all not considered to be magic. They are just similar to magic. Also there are also some supernatural power performed by some NPC as they claim, but as according to them, "these are not real magic and they have been lost since Aincrad float onto the sky."