Kai, Cole, Zane, Lloyd, and Jay stood on the shores of Ninjago City, watching as Flya merged with the sea. The transformation was beautiful yet terrifying, causing an eerie glow to emanate from the waters.

As the glow intensified, crystalline structures started to emerge from the sea. These structures were controlled by the Overlord, who was intent on regaining his lost power.

The ninja knew they needed help. They reached out to their past allies, hoping their combined strength could halt the Overlord's plans.

Meanwhile, the Overlord summoned older villains, each of them eager for a chance to defeat the ninja. The city was filled with fear and anticipation, the battle was imminent.

The ninja and their allies gathered, preparing for the onslaught. They knew the battle wouldn't be easy, but they were ready to protect Ninjago at all costs.

The battle began with a barrage of crystal attacks from the Overlord. The ninja and their allies fought bravely, but the villain's power was overwhelming.

Lloyd, feeling the weight of the situation, began to question whether he should use his oni powers. He knew the power could help them win, but feared losing control.

The battle raged on, each side pushing their limits. The Overlord's power seemed to grow with each passing moment, his crystalline army proving a formidable force.

Lloyd's doubt continued to grow. He felt the pull of his oni powers, but remembered the warnings of his past. He was at a crossroads, the fate of Ninjago hanging in the balance.

In the end, Lloyd made his choice. He chose to use his oni powers, deciding that the risk was necessary to save Ninjago. The final battle between Lloyd and the Overlord began.

With a surge of power, Lloyd fought against the Overlord. The battle was fierce, each blow echoing through the city. But with each strike, Lloyd felt more in control of his powers.

The Overlord was taken aback by Lloyd's newfound strength. He tried to fight back, but Lloyd's oni powers were too much. With a final strike, Lloyd defeated the Overlord.

As the Overlord fell, the crystalline structures crumbled, and the sea returned to normal. The city rejoiced as their heroes stood victorious, having saved Ninjago once again.

The ninja celebrated their victory, but they also acknowledged the risks they had taken. Lloyd's choice to use his oni powers was a reminder of the sacrifices they might have to make to protect their home.

As they watched the sun set over the now peaceful sea, the ninja knew they had faced one of their greatest challenges. But they also knew that as long as they stood together, they could overcome anything.