For every power that you pick up now, you are granted a complete and incredibly extensive mental archive filled with information, techniques, exercises, blueprints and so on that can considerably speed up your progress with it. If you focus you can actually enter an internal world where this archive manifests in a manner of your choice, whether it be a library, a lab, or whatever else you need. If you possess a power that grants you a personal or internal world/domain of your own, your archive can also physically manifest there as well. The archive will grow the more of it you learn, seeming to never reach an end.
Mentor
You can now summon a simulacrum of anyone that possesses knowledge of anything in the archive. If there is no one that you are aware of, or simply do not have one that you like, you can instead have the archive construct a perfect teacher for you, and can freely swap teachers at any time.
Library of Alexandria
Instead of simply receiving an archive for your power, you receive an archive of everything. This includes information from other universes and anything else you can think of. This doesn’t give you the power, skill, or know how of any other power, but it does contain the knowledge for you to peruse inside it.