Ok, so lets say you get dropped into Earth Bet. Cauldron are gone. The Triumvirate are missing. Here is what you do:
1-Meet with Accord. Warn him of his untimely death in new Delhi. Trade this information in exchange for three things: a million dollars, Blastos contact details, and a sample of Flechetteβs dna.
2-Find Blasto. Persuade him to work for you for a while in exchange for a colossal amount of money. Move into an abandoned warehouse-Outside of Boston, thatβs too much heat. Weβre going to Malden, Massachusetts.
3-Begin mass producing Flechette clones. In New York City, Flechette #1 begins to have dreams of a cold, dark laboratory. Irrelevant. The clones will be confused and wonβt have proper memories, making them easier to handle. Once you have about 25, begin the next step
4-Attend the next Endbringer fight: Leviathan, of course. Leave Blasto at home, and avoid the front lines yourself. Deploy the Flechette Clone Army and tell them to aim for the base of the tail. Leviathan is injured, but survives and retreats. 10 of the 25 Flechettes have died, plus original Flechette who was killed in a jealous rage by the clones.
5-Now back home, browbeat the remaining members of the Flechette Clone Army for their perceived failure. In your sleep, get murdered by the leading Flechette for sending them into the meat grinder. Blasto is now their slave.
6-The Flechette Clone Army, now an independent and belligerent force, begins to terrorise Malden. Local heroes and villains are torn apart in random conflicts that quickly escalate into lethal violence. They wander around the city like ronin, picking fights for no reason besides boredom and aimless rage at their awful situation. They stick together due to shared trauma and the charismatic leadership of Flechette #9.
7-Blasto scales up production under constant threats by Flechette Clone Army Leadership. Increasing clashes with Protectorate forces lead them to pursue rapid growth. More clones are produced in an increasingly refined process, and are indoctrinated from creation with the nascent values of the Flechette Clone Army. There are now over 100 Flechettes roaming the city and squatting in buildings in several city blocks that they have staked out and cleared of life. Many of the Flechettes are now fucking each other. It could perhaps be more accurately characterised now as a polycule.
8-Next Endbringer battle comes and goes, and the Flechette Clone Polycule stays at home. They have angrily rejected the ideas of both altruism and a higher purpose, and become increasingly nihilistic ideologically. Few of them are happy. They take more ground and kill more heroes. Malden begins official government evacuation
9-Blasto attempts escape using a homunculi he cooked up. Flechettes catch him before he escapes city boundaries, and kill him. Now incapable of reproduction, the Flechette Clone Polycule is a much more limited threat. However due to a tragically poorly timed decision, the city of Malden is then nuked that same day in order to contain the threat. Humanity now has absolutely no hope of killing Scion or any Endbringers.
And that is how you do it!