Erak's Book of Everything

You use an action to create a shadowy door on any unoccupied surface within 5 feet of you. The door is big enough for any medium sized creature to reach its hand into. When the door is opened inside is a demiplane 1.5 feet in each dimension, made of wood or stone, where you can hide and retrieve a book. You can put the book back and dispel the door with a bonus action. After a week the book becomes infused with the magic of the demiplane and will return if destroyed, retaining all information written in it. 

As a Bonus Action you can look into the book finding any information you have previously written in it. You can repeat this bonus action on subsequent turns until concentration is broken, or the spell ends. 

If concentration is broken, or the spell ends, an attuned book is returned to the demiplane and the door disappears. If the book is not yet attuned to the demiplane it remains in the material plane and the attunement process must be restarted.  Any items left in the demiplane other than your book when the door is closed are destroyed.

Ritual: Spell can be cast as a ritual with a casting time of 10 minutes.

At Higher Levels: When you cast this spell using a spell slot of 4th level or higher you gain access to "Erak's Book of Everything".  You make an Intelligence DC 15 and locate the demiplane containing Erak's Book of Everything, the DC is decreased by 3 for every slot level above 4th. The book is a magical wondrous Item that contains the writings of the most powerful wizards in history. The book only allows truthful script to be written in it and causes 10 (2d10+3) Force damage to anyone attempting to write false information in it. As a Bonus Action you can look into the book finding any information previously written in it. Your GM will tell you what information you find. You can repeat this bonus action on subsequent turns until concentration is broken or the spell ends.