Murder Drones AU - Hollow Earth

WARNING, MAJOR SPOILERS!
FINISH THE MURDER DRONES SERIES BEFORE READING ANY OF THIS, HELL THIS DESCRIPTION WILL HAVE SPOILERS IN IT!

After the finale of what was the hero's journey, the trip seem to rest east after knowing that the threat that was Cyn is gone.
But was that the true end of the Hero's journey? For some they say yes, while others believe that this was merely the beginning.
In this story that is true, the fight with Cyn was merely the beginning, for eyes of older times looked on at the aftermath of the fight, and one set of eyes was watching very closely, monitoring the brawl, once he gone by many names, now this being is after the trio, for what? Who know, but all that is certain is that, quite frankly, he won't stop, he shall never, ever stop until he has the main trio in his compound.
Under the dome, his Dome.