All go find the Child of Prophecy then.
Mist-covered Avalon bet on Merlin's prophecy out of desperation, but now, regardless of King Arthur, there's only one King on Great Britain, and that's Duncan who will ascend the throne in the future!
King Uther, that old thing, has to step aside.
After Duncan slew God's Whip - Attila, Mist-covered Avalon has already won massively. For the next thousand years, there's no need to worry about the disappearance of myths. As long as Duncan's immortal military achievements remain in human history, Mist-covered Avalon will undoubtedly be repeatedly mentioned in legends.
In fact, there's already a legend now about the Sword of Oath and Victory. Avalon's faith wants to concentrate stronger power to forge a true Holy Sword, sufficient to counter the church's 'Lance of Longinus'.
