Corvo led them all inside and told them to begin looking around to find any clues of where the alicorn and changling might be. He made sure to put up a shield around the castle as to make sure they don't leave or else he'll not be annoyed at not finding them but upset as well.
Every now and again he felt like he was being watched and turned to see where the feeling pointed him and found nothing. So he shrugged it off as just a feeling from being inside a ruined castle and creatures were just watching in curiosity.
After hours of searching a very irritated said,"Uhhh, how are we going to find these two, they're nowhere to be seen and I just want to go nap on a cloud instead of this." Corvo stopped looking to and looked at the said pegasus and replied, "Because we are helping not just these two but all Equestria as well."
Twilight still was trying to figure out what he was going to do would help both the alicorn and changeling would not help them but all of Equestria as well. So the alicorn asked, "How is showing the good of these two mares going to help not them but Equestria as well exactly?"
"It's a surprise princess and trust me about this alright," Corvo said in a calm but excited voice.
"Oooo I love surprises except I already what it is and I'm happy that it will make everypony happy because I like making ponies happy and I love surprises, wait I already said that all well!" exclaimed a very hyper Pinkie Pie. "Yes yes Pinkie we know you like making other ponies happy and throwing surprises but calm down darling you know you can't spoil the surprise after all," said Rarity.
Corvo was happy to see that things are going according to plan. He then turned around and saw something staring at him for a split second before disappearing from sight. So he went to investigate and looked around the area he saw it from and saw what he couldn't believe and his mouth dropped.
Cowering against the wall was the changeling he was looking for. She was scared and when he tried to offer her his hoof she cowered away and managed to hide away from him. He was hurt a little by her hiding from him but he was glad to know that he found one of the two mares he was looking for.
Then he started calling out for them, "It's alright I don't want to hurt you two I just want to talk."
The others were confused by him calling out to those they sought but didn't question it and watched him intently to see what would happen.
"Look I know your history and I have to say I can't blame either of you. One of you was jealous of your sister and the other was just trying to help her subjects from starving," Corvo explained knowing that would get their attention.
And sure enough it did. Two figures jumped off a elevated ledge and landed on their hooves but stuck close to the shadows to keep themselves concealed from the Mane 6 as to not be threatened and attacked by them.
All of the Mane 6 except for Pinkie Pie and Fluttershy were confused as to why they were trying to conceal themselves as if their lives depended on it. They were also confused to the mane of one of them looked liked Luna's. They were going to question it but Corvo looked at them and shook his head. So they kept quiet but kept their guard up and eyed the figures suspiciously.
Corvo looked back to the figures and couldn't help but crack a small smile. The figures were curious as to why he had that smile. One of them who was afraid of what she thought he might have tried to do something was know just as curious as the figure beside her. The figures didn't say anything but gestured for him to speak.
He saw them give him the gesture to continue so he did. "I was searching for you two because I want to show the good in both of you and show you two never wanted to hurt anypony and show that everypony they were wrong to not judge you two until they realized the pain you both were in," Corvo revealed with tears threatening to fall.
The figures were touched at his honesty and compassion to help them and couldn't help but have tears of their own as well. He clearly showed that he was willing to do anything to prove their true intentions was not that bad in the first place. They believe that he is what they were looking for to prove them innocent of their past crimes. Something else came to their mind and instantly knew what it was and blushed. One of the figures that was the changeling knew what this feeling was and couldn't help but be glad. She always wanted her own special somepony and his little speech was filled with enough love for both of them that indicated he felt the same way as well.
The Mane 6 was shocked at what Corvo said. He was willing to do anything to prove who ever these two were that they were innocent of whatever they did. Everyone was silent for a few moments until it was broken by Rainbow Dash asking, "Why is it so important to you to prove these two are innocent of whatever they and who the hay are they?"
Corvo looked at the figures gesturing to them to come out and they nodded in understanding on what's going to happen next. Then he looked at the Mane 6 and answered, "Because they were misunderstood and punished over something that could have been avoided. Everypony I want you to be more acquainted with the mare on the moon and changeling queen themselves."
As he said that the figures stepped out of the shadows and revealed who they are everypony's except Pinkie and Fluttershy's jaws dropped.
Corvo then said the names of these two familiar beings in front of them.
"Everypony, Nightmare Moon and Queen Chrysalis."