Disclaimer to avoid stealing credits unintentionally: the Redemption Keyblade is created by nachtwulf in DeviantArt
Note to point out: The way that it's designed, it gave me the idea that it has the magic to either reform the targets in the light back into their former pure selves or to send those targets to the afterlife or safe passage into the heavens. This is why it's called the Redemption Keyblade
Hanji called out as Cecelia is lost in her thoughts: "Hey Cecelia! I have something that I want to show you. Are you aware of the experiments that I'm recently researching on?" Cecelia looked at the woman and replied: "Alexandra gave me bits of information about it. You recently found out that these creatures called the Titans feed on sunlight? I can only guess that the Titans can't move at all in nighttime." Hanji replied as she thought of that theory: "Well, that is rather a good guess because there were no reports of any Titan attacks at night. Anyways! Would you like to take a look?" Cecelia nodded and said this: "Under one condition. I would like Captain Levi and his sister Alexandra to attend this arrangement of a meeting with us on those Titans you have captured." It sounded like a strange request, but she figured that Levi must have some duties as Cecelia's superior officer. She agreed and they both waited until Levi and Alexandra showed up to accompany them. Hanji turned to the bronze beauty as she starts to explain: "I tried to even experiment on communication. But so far, I couldn't learn much." Cecelia nodded in silence and started to walk forward. Rika is also accompanying the small group and she asked, "Cecelia? What are you doing?" Everyone watched as Cecelia slowly stretched her right hand forward as one of the two captured Titans noticed. "It's okay. I'm not here to hurt you. It's alright," she said as she slowly starts to walk a bit closer. Alexandra was just about to shout at Cecelia to get back, but this is when the unexpected happened. That one Titan oddly cooed as soon as it looked into her eyes and nuzzled its head against her hand as if it's a pet longing for a little attention. Levi couldn't find much to say as his mind went blank and the same happened to Alexandra. Cecelia took seven steps backwards and stretched out her right hand. A bright light shined as she grasped onto an item in hand. It's like Erica's Keyblade weapons except that this one is likely created from the heavens above. She held up her weapon up high and began to gather this source of heaven's light and pure magic into it before releasing onward: "Sacred Redemption Light!" Hanji was about to intervene, but even she have to shield her eyes from the light. The two captured Titans screamed and then their cries are becoming more human-like. Their bodies began to shrink and form as if they are being reformed one bit at a time. As the light faded away, even Hanji couldn't believe her eyes. The Titans that have been even tortured for experimentation are seemingly reformed into human beings.
Levi walked forward and said to Cecelia: "Is this the reason why you were skeptical of telling me about this magic before?" Cecelia turned around to look into his eyes: "Even from what you have witnessed this far, it's still possible that you don't believe that this is real. And it's understandable because anything that has to do with magic isn't on the record here." He mentally began to understand and mentally scolded himself of why he didn't notice her reasoning sooner. He sighed and responded: "I must be an ass for not seeing why you didn't want to tell me. And you surprised me again by showing me that anything is possible. I don't usually say this out loud, but you certainly are one of a kind." Alexandra was surprised by her older brother's words, but she laughed internally at the same time. That's because Levi has never complimented anyone in his entire life. Well, he does support his sister and put in a few compliments. But he was never this open until Cecelia came along and it's only been about two days if not three. As the sun is setting down, it's time for this ceremony for even the new cadets joining in. She was told that this ceremony is held after three years of training. The cadets have the right to choose among the Garrison Regiment, the Scout Regiment, or the Military Police. She already know which side to join as she has a promise that she made willingly by heart. Erwin started his speech to a large amount of cadets: "In the last four years, 60% of the cadets have met their end. Whoever wishes to stay and put their lives on the line, remain here. But first ask yourself. Can you give your heart? Can you give everything for humanity? Those wanting to join other Regiments are dismissed." This caused the cadets to shake slightly in fear and start to reconsider their decisions. Just then, Axel nudged on Eren's shoulder to look as Cecelia starts to walk forward. No one knows what she is thinking as she's now standing on the stage facing the others. She stood up tall and executed the Salute before speaking out strongly: "I am willing to give even my existence to the cause! My parents who have served mankind not too long ago have done their part! Now is my turn! Strangers or close ones among you all, I..Cecelia Harumi Miyamoto...stand before you all as of now because I have many others that I swore to protect!"
Some cadets that aren't willing to put their lives on the line have left the Scout Regiment. But as if this speech from Cecelia's heart gave the inner strength, even Alexandra couldn't believe her eyes. More than half of the people in the group have actually stayed. Erwin was impressed as he could see the strength from Ryu and the kindness from Sayuri residing in Cecelia's heart from those words. He said as he also did the Salute: "For those of you who are standing, you are now one of us! Congratulations on joining the Scout Regiment! Those of you that stayed have worked through your fear. You have proven yourselves courageous. Each one of you has my respect." Cecelia's words from her heart spoke from within her mind as she stands tall: "Mother...Father...I have a promise...that I swore to protect Captain Levi and all of mankind. And that's a promise that I will keep as long as the light shines within my heart!"