The objective and restriction section just means that the beginning objective has no blockers or other issues with it. Looking at your account your Natalie Dragon is level 150, but your Nate Dragon is only level 66. You need to level the 20th Crusader up to level 150 and then his reset the world ability will be available. The icon at the top of the game is the objective icon, not the reset button.
 "Crusaders of the Lost Idols"){kind=icon}
The objective and restriction section just means that the beginning objective has no blockers or other issues with it. Looking at your account your Natalie Dragon is level 150, but your Nate Dragon is only level 66. You need to level the 20th Crusader up to level 150 and then his reset the world ability will be available. The icon at the top of the game is the objective icon, not the reset button.