The goal of the End Game is to accumulate enough wealth for you and your family to stop.
Stop putting your wealth at risk. Stop the gambling and risk taking with investments of any kind.
You would finally have enough money and personal power to walk away from the investing game and spend the rest of your life doing something else!
When exactly do you reach the End Game?
When you have enough principal invested safely for your after tax-income to match or exceed your annual expenses on an ongoing basis. This would include budgeting for the lifestyle you truly want.