The Guardians became silent when John asked that. This was a huge prophecy in the book of Oa. The Guardians hated that Prophecy because it mentioned the rise of many lanterns and infighting among all the lanterns.
"Don't tell me the Blackest Night has something to do with Black Winter." Appa asked.
"It doesn't but according to the prophecy Ganthet and Sayd are supposed to be the Guardians of Blue Lanterns. Wasn't it?" John asked. There was total silence on the Guardians as they didn't know how to reply.
"Yes. That was the prophecy. But why are you saying this?" Appa asked.
"I want Ganthet and Sayd to make a Blue Lantern corp." John said.
"I will summon the blue lantern element and even the embodiment of the green and the blue element." John continued.
"Are you sure it's a good idea? It would mean we will trigger the Blackest Night prophecy." Appa said.
"There are no emotional spectrum forces in this multiverse. If new forces do appear I will handle it myself. For now I can bring Blue Lantern and the embodiments easily." John said.
"If you say so, but we just hope we don't trigger the Blackest Night prophecy and have more problems on top of Black Winter." Appa said.
"Don't worry about that. Now it's time to bring the embodiments here. They will choose their hosts willingly. I will place Entity Adara, the embodiment of Blue element on Ganthet for the time being and Entity Ion, the embodiment of Green element can choose it's host willingly as there are already Green Lanterns here." John said.
"OK. I will accept the Entity willingly and vow to use the power of hope to serve the universe and it's protection. At this time of approaching Black Winter we do need the power of hope." Ganthet said.
[Ding
Total fan values - 7 billion
Fan values required to extract Ion and Adara - 1 billion]
John spent 1 billion and waved his hands. As he did that, a huge bird-like being that glowed in blue light emerged in front of John. The bird was so huge that it shadowed the citadel and all the green lanterns that were present on Oa could see Adara.
John placed Adara on the body of Ganthet and then proceeded to summon Ion. Ion was green in color and had the shape of a huge whale. It's size was bigger than Adara and this time too all the green lanterns were able to see Ion appearing. It's appearance made the rings of all the green lanterns vibrate all over the universe and all felt a huge boost of power.
Ion then vanished right from it's spot as it went away to find it's host. It depended upon Ion to choose it's host. The Guardians, John and Emma looked at all of it with a sigh. From here on there would be two lantern corps in the universe and this would give an immense help to green lantern corps.
"Ganthet and Sayd, from here on you both will have nothing to do with Oa and will be the Guardians of The Blue Lantern corps. We wish you a successful journey." Appa was the first to break the silence and said to Ganthet and Sayd. As Guardians they had left emotions a long time ago and thus there was no such tears or sadness in separations.
"Now the last reason, I am here. The green and the blue Lanterns can now take their lantern and place it as armor around their body. This would give more power to the existing lanterns." John said. As Hal Jordan in the 'Kingdom Come' comics used the lantern as armor around the body and became more powerful as he defended Earth from a space station he had made.
John spent another 100 million and made it into a book and gave it to Appa and Ganthet so that both could use the knowledge of making such armors from lanterns. The last update of the system allowed him to bring alternate versions from the comics and thus helped him a lot. Since Ganthet and Sayd were the Guardians that made the blue lantern of hope, he was able to make a blue lantern corps from scratch.
Every color of the rainbow corresponded to the emotional spectrum in the DC universe. For example, green signified will, blue signified hope, red signified rage and so on and so forth. The other spectrum couldn't be extracted as the characters were never present in any movie or series.
By this time all the green lanterns present on the planet arrived at the citadel to see what was going on. They thought someone attacked the Guardians but were relieved to see that nothing had happened. Guardians then called for a meeting of all the green lanterns in the universe because they needed to discuss the next course of action.
(I will explain the story of Blackest Night when the time is right. Don't worry. It is one of the best comic book stories so of course I will explain)