Rhea

"Hello, master. My name is Oberonia Rhea. I'm the Fairies' firstborn who commands all fairies in war." "Unlike my other sisters, I was created in the Battle Maid Project, and I was given the ability to control the metal particles through nerve electrical signals. However, with the Battle Maid Project seeking the use of more practical and previously-used weapons, the Fairy Project that used me as a center-piece was started."