Im on season 6 lol

You ain't seen nothing yet.

… w-what’s there…?

A handful of pirates who are seemingly indestructable and even feared by the five elders.

... 5 elders?

The heads of the world government and the ones that the marines answer to, each with immense power (influencial, financial and even physical to an extent that is thus far unknown).

I can't say any more without spoilers, but I'll provide a wiki link to read to whatever extent you choose if you wish:

https://onepiece.fandom.com/wiki/Five_Elders