```
Sky City might have risen, but clearly it couldn't have flown far.
The cities of Green Grass Civilization had been extinct for four thousand years, and it was simply impossible for humans to sort out those complex power systems.
Moreover, the energy accumulated by the opium poppy trees was too little, and they might run out of energy halfway through the flight.
They had to find a greener area close by where they could recuperate and nurture themselves over a long period to regain their vitality.
"King, there really isn't a closer oasis to the north, I've searched for a long, long time, truly there is none."
The expression on Lu Da's face was one of exhaustion and helplessness.
"You've worked hard, doing your best is enough," Lu Yuan consoled after a moment of silence, "Rest well and enjoy some free time in the city."
"Oh, right, here's three thousand dollars for you. Living in human society means you have to follow human rules; you mustn't commit misdeeds, understand?"
