About Shingeki wa Mahou! (CLOSED AU)

UPDATE: The official list is now CLOSED. It will reopen soon though!
For now, I'll be working on making a DA group for this AU

Here's the main gist;
In the world of magic, monsters have overrun 60% of territories. As a result, cities are guarded with a magic barrier.
However, after trying every counter spell, the monsters would not all disappear at once.
So there is only one way to stop them; Fight back.
A school was opened up in order to learn magic and fight; The wings of Magic academy. 
When there, each student is assigned the power of a gemstone. 
However, Somehow Eren and Nico, two students at the academy, both got the same gemstone; the white diamond. 
So as a result, they must work together in order to use magic and defeat the monsters
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Characters and their gems (Note: students can have the same gem, but it usually is a different color, except for Diamond, Ruby and Sapphire.) ; 

Eren Jaeger: Half of the white diamond
Nicole 'Nico' Dorothea: : Half of the white diamond
Mikasa Ackerman: Red Ruby
Armin Arlert: Blue Sapphire
Levi Ackerman: Green Emerald
Jean Kirschtein: Red Jasper
Marco Bodt: Green Peridot
Reiner Braun: Red Garnet
Bertolt Hoover: Orange Quartz
Connie Springer: Teal Zircon
Sasha Braus: Teal Aquamarine
Historia Reiss: Pink Pearl
Hanji Zoe : Purple Alexandrite
Ymir: Black Onyx
Annie Leonhart: Orange Garnet
Alma Mercer ( XGothicArcherX's OC ) : Yellow Topaz
Remelia Frost ( usagii-p's OC ) : Blue Lapis
Katia Davis ( landra15's  OC ) : Purple Amethyst
Ellena Wilburn ( RavanaB1's OC) : Green Turquoise
Fumi Murakami ( RosiieChan's OC) : Undecided
Nicki, Dawn and Saital Shifuto ( EspyFandoms's OCs) : Blue, Yellow and Red turquoise 
Roman Mancini ( chrisolian's OC ) : Orange Opal

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If you wish to join this AU, comment your character's name and their gemstone