You've been imbued with a sliver of divinity, gaining a Familia mark on your back that starts at level 1. This will allow you to go past the bounds of the typical mortal body by gaining Excelia by doing actions, such as fighting or researching magic. Upon reaching a certain threshold of power, you are able to condense all that you are through a process known as leveling up. Leveling up resets your stats to zero while still retaining all previous growth. You will be able to update your status in times of rest. You will be able to join a god or goddesses Familia with this and your abilities are displayed on your Falna. You cannot lose your Falna, no being is able to seal it or remove it. You have no spell slot limitations and will gain a new spell each time you level up. You are able to gain Skills and Developmental Abilities this way.