So Grimlock. Grimlock was confronted by Maze, Khrona and Hakku after they went through all that they went through (Actually, this might have been before, but I don't remember. I'll work that out in the final draft) and they talked and they fought and whatnot, but Grimlock was still too powerful. So he ended up bringing more Grims from the Cauldron, one of which was his father, Grim, and the other his brother, Grimnyzmal, who though was still alive, lacked his full power due to being mostly consumed by Vash in the past. With that, all was going according to Grimlock's plan. He wished for this planet to become stronger or die in the process and be consumed by him, and they seemed to be getting stronger, though his training wasn't complete yet, since they were all still too weak.
So he went back to his old house, a manor located in the Enigmatic Ruins where the family once found the tablet of their ancestry, and awoke the sleeping Hades that existed protecting his Cauldron. (This also might have happened before, I don't rememer) After a good wake up spar, he asked his old friend to wake up the sleeping Guardians of Chaos and their Weapons of Chaos to help 'cleanse' the world again. Hades happily complied for his old friend, and awakened the sleeping beasts of Chaos from their slumber.
Once this happened, this also awakened the Skull Heart, which was created by Zita who was the original Skull Girl. When it awakened, it chose a new Skull Girl, but also inevitably restored Zita's power as Skull Girl as well. If you're wondering where Zita was in all of this, she was helping the Chaos defeat Aizen waaaay before Grimlock started his stuff. But yeah, so, with that and the awakening of the Lich, Zita was overcome by the power of her former inner evil, and was also targeted by Pestilence (one of the Horsemen that had awakened) in order to become the Queen Lich. She went on a rampage for a while that Chita had to stop, since there was no longer a Head Witch of the Witch Province and temporarily took the title only to get her mother back and lead the Witches. She sent some people to go kill the Skullgirl, but that didn't work out too well.
So in the meanwhile, Maze had adopted the Heart of Chaos from such an event and become the Timeless Hero, able to traverse time as he pleased. When he found his sister, Zita, contaminated by Pestilence and her inner evil, he sought to purify her. And, he did, however she was still awakened fully as the Parasite Lich Queen, and was still falling to the Sway of Magic. So though she wasn't possessed by Pestilence anymore, she was still quite evil. She worked undercover, but was still confronted by Chita, who would not fall for her shit at all.
After learning about his family heritage, Khrona sought out his father, Shinra, and fought him in battle in order to figure out what was the truth. Even so, when he did, he was defeated by the power of the mortal man with the godly chakra, and wondered how chakra could be so powerful, even on someone that was simply a normal human. That was when Shinra told Khrona about control, and that he lacked control over himself and his power, which is what Khrona had been trying to achieve with the Thirteen Restrictions (For however long he had them by this time.) He went insane, but also realized that he fabricated his own past, and was actually left alone all those years until he met Misery and Despair. Even with this mind-crushing development, he kept himself at bay. With the Insanity slightly kept at bay, there was a new Insanity that had arisen from the ashes, known as Soul Edge. This weapon felt like the power of a Kishin, and Khrona could feel that ZK was after it. As the new Keeper of Insanity, could not allow ZK to do that so haphazardly, and fall to the Insanity and become another Kishin. So, those two fought. As they did, Khrona and ZK, much like with Zeik, went on this extravagant battle across the world and then into space, being rebirth with three trillion times his own power. This brought on his true form (at the time) of the Black Dragon. Eventually, Khrona and ZK fought to a stalemate as well, just like with Khrona and Zeik before, and he also gave ZK this same warning of what was to come, just as he did with Zeik. (Actually, if I remember correctly, Khrona was fighting them both simultaneously but in different areas. I'll edit that when I do the final draft.)
Meanwhile, Grimlock's ulterior plan to get the Grims out of the cauldron was succeeding, and they were appearing one by one. Shinigami (who was still Shinsei) caught wind of this and decided that the time had come to finally end this era of darkness. However, he was going to need Khrona's help...
But by this time, Shinta came in looking for Death, and tried to destroy Shinigami's school (Since he is indeed Death). With that, Zeik and Kham came to stop him, and then eventually, so did Khrona. With everyone gathered, Khrona made an announcement that he needed everyone to work together to make a reform in the world of The Lost World, or he was going to become everyone's enemy. Many of them didn't take this seriously, and just brushed it off, but Khrona went about his business, anyway. Whether they believed that he was going to be their enemy or not was up to them, but what he wanted from them was unity. After that, they all went their separate ways.
Shinta, however, did not leave the Dusk. Instead, he continued searching for a way to find Death. Khrona, who had become the Phantom again, caught up with Shinta and inquired on what he was doing. He was looking for a way to find Death, and Khrona gave him the idea to kill one of the Horsemen to incur Death's wrath, forcing him to show up. Since Pestilence had taken it upon herself to try to infiltrate the isolated reality that was the Dusk simply because the Four Horsemen had appeared, seemingly in synchronicity to the Four Guardians of Chaos, Khrona marked her as the prime target for Shinta. Thus, with both of them on the same team, Khrona and Shinta went to pursue Pestilence.
Pestilence, naturally wanting to spread her plague to all parts of The Lost World, sought to assimilate the Dusk with that world since it was occupying its space, and figured that the only way to do this was to become the Tree of Life. She was weakened as well, and contaminating that tree would give her the power to recover and become the Tree of Life at the same time. With a successful infiltration, her terrible plague was cast upon the Dusk, which brought on more calamity than before.
Luckily, Shinta and Khrona were already there before it could spread anymore, and Khrona used his power to isolate the spread before it became too great. Shinta went on ahead to fight Pestilence himself, and ended up cutting her out of the tree. Khrona assisted by ascending to his 6th Restriction, which was apparently what he was doing with the Thirteen Restrictions he found out about (I'll put that in there later, too, going off of memory, remember?) and assisted Shinta in removing Pestilence fully from the Tree. However, the Tree of Life was already eaten away at beyond repair, and there was no way to save it. Eventually, all life would suffer the same fate if Khrona let this be.
So, Khrona assimilated with the Tree to keep it from dying, which proved as steady life support with Khrona's incredible power. After that, Shinta sent them into the Mind's Void, where Khrona and Shinta killed Pestilence together, which called upon Death. With a furious Death, Khrona used his new powers of life to combat Death, but ended up cutting Death off from himself, and in such, killing himself at the same time. However, once that happened, Khrona was able to become the true Tree of Life, and became life itself, being reborn simply as Life and Rebirth thanks to Death's endeavors.
After that, Death and Shinta went elsewhere to continue their battle, leaving Khrona as the Tree of Life to restore life to the Dusk. Though, he one upped that, and also started to build a newer, bigger Dusk Village. This was the birth of the Dawn.