Gemini Magic

Gemini Magic (双児宮, Sōjikyū no Mahō), also known as Duality Magic (陰陽の魔法, Onmyō no Mahō) & "Magic of One's True Self" (一つな真打の魔法, Hitotsuna Shinuchi no Mahō), is a rare & exceedingly dangerous form of magic that's existed for nearly a millennium. Due to its age, it's also confirmed to be a form of Lost Magic. There's little information about this peculiar form of magic, but it's stated to be related to the very constellation it's named after. This is later confirmed, as the magic deals with the principles of duality. It's also confirmed that this magic is based off of Nirvana — an ancient and powerful magic that forcibly manipulates such principles to the user's whim; this makes it a Subspecies Magic by default.

Unlike the its predecessor, it's considered to be a Caster Magic — the user requiring no specific item to activate it. The effects of this magic has been equated to that of the Black Arts, making people think that it's part of the eldritch fighting style. However, this has yet to be confirmed, as there's no substantial proof to make such claims. It's unknown how many practitioners there are, but it's few in number since knowledge of this magic isn't well-known or properly recorded.

The only known user as-of-date is Gemini — a user of the highest caliber, which would make sense since Gemini embodies the concept of duality.

Description
"It's a known fact that everyone and everything has two sides to them. One they let the world see and one they keep to themselves. There are no exceptions. However, through this magic, the side that's hidden from the world — the one people try so desperately to hide, comes out into the open. Now.... show me your true self!"

- Gemini to an opponent before using this magic

Trivia

 * The nature of this magic is based upon Nirvana from canon storyline & the dual-nature of the Gemini Saints from the series Saint Seiya.


 * To an extent, this magic was also inspired by Reverse Ideology — a unique magic created by  Dreams of Serenity . All credit goes to her.