This still cannot be correct, with no locks and these rewards that would mean you can just stay here and get a whopping... 11 echos per action.

1 bottle + 5 scraps + 2 pass + 2 shores = 11. per single action. which redirects back to champions so you can take it again. and again. and again.

2.50 + (5 * .5) + (2 * 2.5) + (2 * .5)

This surely cannot possibly be true, so it can't unlock at 421? That would be the best possible grind in the game? Why would I ever leave when i could spend a few days here getting thousands of echoes.