Once per long rest you can use a bonus action to declare that you found the edge of the world, giving yourself advantage on deception checks to make up a reason for why you didn't bring evidence for your discovery.

If there is a sphere within line of sight of your character you go into a rage state where you are immune to all damage. You run/fly/swim/climb/burrow, up/down to the sphere and hit it for 800d1 force damage (ignores immunities resistance and legendary immunity/resistance) then you go back to where you once were and everyone is oblivious to what you just did.