Tinker

/tinker

Magic dust can be used to increase the success percentage of your enchanted books. Use books that you do not want, in exchange for Secret Dust.

Click the top left box twice to confirm you want to exchange, you will be given Secret dusts. Right click the secret dust to discover what it contains, not all Secret dust contains magic dusts.

Some contain Mystery dust, which is not useful and can be discarded.

Secret dust and Magic dust are tier specific, you can not use an Elite Magic dust on a Legendary book.

Once you have some Magic Dust - drop it on top of an enchanted book you wish to increase the success of.