Disclaimer: I do not own Adventure Time, Destiny, or Adventure Time Insurrection. They belong to their rightful owners Pen Ward, Bungie, and 209riveraiseral.
Prologue:
It has been two years since Finn's destructive antics had happened and he is now happily courting the queen of the Fire Kingdom. All of the damage that he has done to the Land of Ooo has been fixed, over the course of the 2 year period, by him draining all the water out of the Fire Kingdom, allowing the cavern to heat up and become habitable again, and his crimes have been forgiven, with the except of 9 major Kingdom's who still harbored hatred and anger against the Finn for his rogue antics.
The wretched evil offsprings of the Lich have been vanquished and Ooo lives in peace and harmony under the protection of Finn the Human (or he was once thought to be.)
The inhabitants have now discovered his elemental origin and the reason they surfaced shortly after the events of the Red Throne, however despite most of the forgiveness and constant peace that followed after Finn's destructive week, Finn still felt as if he were a danger to all those around him, and in a mad decision, he decided to leave Ooo for ever in order to keep the inhabitants protected from the likes of him.
However Finn is eventually trailed down during his leave from Ooo, and is attacked by the 9 Kingdoms that went down to be called the 9 Nations of Vengeance, despite being ambushed, Finn is able to retaliate and destroy one of their attackers, but in retaliation, Flame Princess is then captured by Aerial Joffrey, the Queen and leader of the 9 Nations of Vengeance. Finn, then ventures into Malice's old lair where Queen Aerial is hiding and has to go through a number of portals and rooms in order to gather the right amount of gems and power crystals in order to activate the final door to Aerial's throne.
Finn is able to open the door to Aerial's Throne, and enter the dungeon area, where he is able to rescue Flame Princess, but Aerial escapes during the reunion, forcing Finn to return back to Malice's lair in order to confront her. Finn corners Aerial on the roof top of Malice's old lair, where a final fight breaks out, between him, and the 8 leaders of the 9 Nations of Vengeance and Finn is able to overpower the army, by turning to Ocara, and destroying em, causing Aerial to fall to her death to the abyss below.
In the land of the guardians, it has been one hundred years since the events of the Red War and the Curse of Osiris and etc. The darkness has fled from the sight of the Traveler and the Last City. The times of the darkness has all but faded into myth now, the only living darkness that still infects the universe is the wrath of the taken. The human race now pushes to rebuild its once mighty race and its Golden Age.
But deep within the cracks of the earth, a thought to be dead evil is lurking, learning the unimaginable strength of the darkness that plagues our universe and who to bend it to his will, for the Lich never dies.
Well, this is the prologue of The Last Guardian bys! I feel like I should have done this first. Also, I want to give a big thanks to 209riveraisreal for helping me with this chapter (even though that he did most of the work with the history to ATI, and the events of Destiny aren't that much of a wow factor) thanks man, I had a lot of fun collaborating with you, I hope we can do this again.