Even if they were all just worthless as clay chickens and pottery dogs before him, there were still a thousand of them, and killing each one consumed a bit of energy; after a few hundred kills, his energy would be exhausted.
This wasn't reality; otherwise, with the supplement from the High Energy Magic Cube, he could have won.
By the time Lin Qing's energy was depleted, the female general, who had been watching from afar, released several serrated discs that cut through the air at astonishing Speed.
He couldn't be bothered to resist and simply gave up to await death, conceding to start over.
Before his second attempt, Lin Qing learned from his previous mistakes, leaving Heavenly Orbital Coordinates on the Source Divine Weapon beforehand, only entering the fray after his energy had recovered.