Archive Patron

The Archive is an interplanar library that is said to contain all written knowledge.

Level 3: Library Access

You have an object tied to the Archive: a card, key, bookmark, etc. As a Magic action, you can use this object to open a portal to the Archive once per day. The portal lasts for one hour. For every hour you spend in the archive, one minute passes outside of it. If a creature speaks out loud in the Archive, they must make a Stealth check against your spell save dc. On a failed save, the creature is attacked by a Librarian. The Librarian is an Aberration of the DMs choice with a CR equal to or greater than your character level.
The time you can spend in the Archive increases at certain levels. 4 hours at 6th level, 8 hours at 10th level, and 24 hours at 14th level.

Level 3: Archive Spells

The magic of your patron ensures you always have certain spells ready; when you reach a Warlock level specified in the Archive Spells table, you thereafter always have the listed spells prepared.

Archive Spells

Warlock Level	Spells
3	Comprehend Languages, Identify, Pass without Trace, Silence
5	Glyph of Warding, Speak with Dead
7	Arcane Eye, Mordenkainen's Private Sanctum
9	Legend Lore, Rary's Telepathic Bond

Level 6: Forbidden Research

For every hour spent researching in the Archive, you gain +1 to the next Intelligence check you make.

Level 10: Compartmentalized Mind

you can concentrate on two spells at once. When you make a concentration check while concentrating on two spells, you make one check for both of them. This check is made at disadvantage.

Level 14: Infohazard

You attempt to open a creature's mind to the dark knowledge hidden in the depths of the Archive. Once per long rest, you can make a Magic action to target one creature within 60 feet that you can see must make an Intelligence saving throw versus your spell save dc. On a successful save, the creature take 12d10 psychic damage. On a failed save, the creature is Stunned until it is cured with a greater restoration or wish spell.