Board Thread:Questions and Answers/@comment-27785544-20160212210011/@comment-25968376-20160213134934

The radius of the aura is smaller than the native effect of Angel and Fairy cookie, hence the "mini" term. It's just a term used for comparison, and like Akrie said, it's not that it will shrink.

For the record, treasures with "miniscule" magnetic aura, such as Very Wet Drink have even weaker ones.