You have undergone more than just a physical change to become a Dragon, you have modified your very identity in order to enact this immortal evolution. You are able to meld into your Dragon form at any time, this quadrupedal form is roughly 40 meters long and 25 meters tall. All magic cast by you has twice the duration and range it normally would have. All Dragons are born with an absolute reduction damage threshold, invalidating all forms of attack that cannot manage to break through this resistance and further reducing all damage that breaches your defenses. These benefits will remain even in your human form. Your Dragon form will instinctually represent you, requiring no conscious thought to design it.