Bound to your soul is a "physically manifested" power know as the "Tower of power". A brief moment of introspection will allow you to choose and enter this ephemeral tower which acts as the axis point of All of your other powers and improvements. Upon first gaining the tower, the time inside and outside can be halved either way, however as you use this power you gain more control over the time difference and resulting manifestation of this power, within the tower any death or destruction caused to your form from any source while within the tower will be reset, essentially reviving you. This doesnt meant that you don't still feel any of the pain or mental anguish that can result from powers or other source, just that any permanent damage is reset.
Enter the Tower and it's lobby, at the beginning the tower takes the appearance of a 1980's multistory apartment building, from this lobby you can find multiple avenues of progression through various doors or mechanisms such as elevators that lead you to doors, find the door that corresponds to the power you wish to interface with. At first all of your power is locked in it's current form, static and ungrowing. While near the door you have the ability to visualize your power in some meaningful, visual way to yourself. This acts as an anchor of your current understanding and feelings about your power, and is the Key to the Door of your Power. Once this forms from your will, you can insert it into the Door.
If you wish to change the aesthethetics or manifestation of the Tower of Power, go through various staff only Doors.
The room that can be found beyond the Door of Power is created to utilize your powers in someway, each room has multiple obvious and hidden puzzles that can be solved using your powers in some way, the method you use to complete the different puzzles will determine how your powers change and grow through the Tower.
If the Door of Power corresponded to a martial arts power, the challenge for a basic growth of the power could be to complete the martial art proficiently against a special target dummy or Power created enemy or challenge. A hidden challenge that could give you a greater generic increase of power might be using a different martial art to defeat the specific martial art to learn it's weaknesses. Different solutions to different perceived challenges can change your powers in various ways, these changes are intuitively known when the challenge is complete, and can be refused.
After completing enough challenges within a room, doors that lead further into the rooms behind the specific Door of Power can be entered. At this time the rooms Aesthetics can be controlled and transformed by you, using your powers as the template for the design of the room behind this specific Power. Deeper rooms lead to greater size, greater growth both horizontal and vertically, and greater challenge.
The Tower of Power will tailor itself to your level of ability depending on what you decide to willingly use in the rooms, and growth factors are highly dependant on the level of challenge that is actually experience.