Third world

>In Chaos there is void
is obviously the void century.
>Troubled shadow, remembers the promised day.
The shadow is Imu who remembers the promise that was set by davy jones that someone will come and overthrow him.
>The fractured moon
The D clan
>The sun god dances and laughs leading the world to its end
Monkey D Luffy gear 5 and the drums of liberation bringing imu down and ending his "world".
>The sun will return once more
The Eternal Mother Flame will return once to the sky when the red line is destroyed and all the oceans become one.
>And a new dawn will arrive, surely they will meet again
A new world will begin once Imu is dead and all the oceans will meet again.

There is your ending in the last arc guys