While you aren't actually the reincarnation of Merlin, people will certainly believe you are due to your magical prowess. You possess the innate ability to cast spells silently and without the use of a focus. Your magic flows effortlessly from within, unhindered by traditional means of spell-casting. Your efficiency and control of magic are instinctual, allowing you to execute spells swiftly without any decrease in their potency and even reduce the amount of magical energy required to cast.
No magic is beyond your reach. Through observation and exposure, you can quickly learn and master any spell, even those you have only witnessed once. Inborn magical traits and abilities are also within your grasp, as your mastery over magic extends to its very foundations. No magical knowledge, regardless of its corrupting or dangerous nature, can harm you. You are shielded from the detrimental effects that would afflict others, allowing you to explore and utilize even the most treacherous and forbidden spells without consequence.
Each time you cast magic, your powers expand and evolve. The mere act of wielding magic fuels your progression, enabling you to uncover new spells, theories, and insights into the vast realm of magic. There is no limit to the magic you can discover and harness. The rules and limitations of magic are mere guidelines to you. You possess the extraordinary ability to bend and break the traditional boundaries of magical practice. This grants you the capability to cast spells that would otherwise be deemed impossible, pushing the boundaries of magical potential.
This does not give you magic alone, it merely acts as generic magical upgrade for any systems you purchase through the CYOA or gain during your journey.