Jack has grown up and just about to hit 15 years old a glorious age for the world of Ramantian (Ra-Man-Tea-An). When one hits 15 they unlock their hidden potential as they become an adult.
Special abilities form allowing for people to gain wonderous abilities. Everyone gains some type of Art. Most people gain weak arts such as extra strength. While that seems like it could help but most have crappy growth making most bearly better than no Art.
They do gain a unique type of energy which can be trained. It is an energy source similar to mana or qi and can be increased in all sorts of ways called Prana. Prana is a source of energy used to power Arts. Passive arts once learned absorb a small amount from the world to power itself while active ones use the users Prana.
The ones most likely to do well are blessed with Arts based around combat. Active ones that can conjure things like fire and ice or allow for energy to form around weapons.
Support type skills are much needed in this harsh world with Arts ranging from buffs and healing all the way to crafter Arts.
Jack grew up in an orphanage and learned basic knowledge for this middle age sword and magic like world. Once one hits 15 they can apply for Art school.
Until one learns Prana, all Art books are forbidden due to being able to learn it but with life as the cost aging your body costing you 3-6 months of your life span.
Jack goes to bed and is excited to learn what he gets.
As Jack awakens he finds himself sore and laying in the forest. He see this weird thing off to the side as he looks at it an interface appears.
Confused but somehow knows how to work it. Sees 3 tabs, system log, character sheet, and quest log.
It is on system log and as he looks at the only message, [Welcome to Tutorial Town #201. Please complete quests to be teleported to lowest level world. Getting back to previous existence will require hard work and dedication. Good luck, previously in Top tier world.]