You are capable of Old Magic from the Age of the Gods that is equal in strength to the True Magics. Along with being capable of this, you are capable of any form of Magic used in any universe you travel to as long as over 1% of the population has the potential to use it, and have huge reserves (though not nearly infinite). You can also choose to be a beginner in either Divine Words, Fairy Characters, or Primordial Runes. You are talented with all forms of Magic or Magecraft, gain the ability to use modern Magecraft without circuits using ancient breathing techniques, and learn more about Magic and Magecraft just from using what you do know in combat, though this process is slow. Even outside of a world from the Type-Moon series, at the bare minimum this ability will supply Mana and strength of Thaumaturgical Foundations equivalent to the modern world as of Fate/Stay Night.