The Kigal-Note:

A notebook that holds an encyclopedia of all kinds of information about Terra Sol, the species that inhabitants the world, and information about the World System.

The book can record any information about species, materials, or anything else that the owner experience. It is also possible to record specific individuals in the book.

It is also able to record notes written by the owner, through the special pen that is included with the book.

Any pages taken out of the book will return to it. In case the page was that of note, the page will turn to its blank state.

The book is made of solidified darkness, and will never take damage, nor lose durability.

The Kigal-Note has an ability that is useful in battle, but this information is classified as top secret, and will not be mentioned in the introduction.

Alvatria's comment: This would be a bestseller if it wasn't for the name.

Garami's comment: As if you would be better than me with naming.